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FA-35201 / Notification interfaces / Open access

Notification burst summary interaction: summary-mount-failed from condensing · case 01

The summary-mount-failed event leaves a notification in summary-visible instead of individuals-visible.

Verified by executionVariant 1 · 38 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Failed condensation leaves a nonexistent summary displayed.

THE FAILURE

Failed condensation leaves a nonexistent summary displayed.

Unsuccessful approach: Dropping individual cards on failure loses the only visible representation.

Case contract

Notification burst summary interaction is a bounded visual-notification workflow with mutable policy state {'items': ['a', 'b'], 'summary_members': [], 'detail_members': [], 'mount': 3}. Its default transition relation is {('individuals-visible', 'burst-detected'): 'condensing', ('condensing', 'summary-mounted'): 'summary-visible', ('condensing', 'summary-mount-failed'): 'individuals-visible', ('summary-visible', 'inspect-burst'): 'expanding-details', ('expanding-details', 'details-mounted'): 'details-visible', ('details-visible', 'collapse-details'): 'summary-visible', ('summary-visible', 'new-burst-item'): 'summary-updating', ('summary-updating', 'summary-update-mounted'): 'summary-visible', ('expanding-details', 'close-before-mount'): 'closing-details', ('closing-details', 'late-details-mounted'): 'summary-visible'}; domain inputs can suppress or redirect transitions and update policy fields, as specified in solve. Different-generation events are inert. Batches apply in order. Optional observe returns the selected policy field alongside the phase.

Why this case matters

Visual notification lifecycle ordering can leave an inbox or toast showing the wrong actionable state even when transport succeeds.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(initial, events, generation, payload=None, observe=None):
    table = {('individuals-visible', 'burst-detected'): 'condensing', ('condensing', 'summary-mounted'): 'summary-visible', ('condensing', 'summary-mount-failed'): 'summary-visible', ('summary-visible', 'inspect-burst'): 'expanding-details', ('expanding-details', 'details-mounted'): 'details-visible', ('details-visible', 'collapse-details'): 'summary-visible', ('summary-visible', 'new-burst-item'): 'summary-updating', ('summary-updating', 'summary-update-mounted'): 'summary-visible', ('expanding-details', 'close-before-mount'): 'closing-details', ('closing-details', 'late-details-mounted'): 'summary-visible'}
    data = json.loads(json.dumps({'items': ['a', 'b'], 'summary_members': [], 'detail_members': [], 'mount': 3})) if payload is None else {**json.loads(json.dumps({'items': ['a', 'b'], 'summary_members': [], 'detail_members': [], 'mount': 3})), **json.loads(json.dumps(payload))}
    state = initial
    for delivery in events:
        event, event_generation = delivery[:2]
        arg = delivery[2] if len(delivery) > 2 else {}
        if event_generation == generation:
            previous = state
            if event in ('summary-mounted','details-mounted','late-details-mounted','summary-update-mounted') and arg.get('mount',data['mount']) != data['mount']: event = 'unknown-event'
            if event == 'new-burst-item' and arg.get('item','c') not in data['items']: data['items'].append(arg.get('item','c'))
            state = table.get((state, event), state)
            if state == 'summary-visible':
                data['summary_members'] = data['items'][:]
                data['detail_members'] = []
            if state == 'details-visible': data['detail_members'] = data['items'][:]
            if state == 'empty': data['summary_members'] = []; data['detail_members'] = []
    return {'phase': state, 'value': data[observe]} if observe else state
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('individuals-visible / burst-detected', solve('individuals-visible', [('burst-detected', N)], N), 'condensing')
check('condensing / summary-mounted', solve('condensing', [('summary-mounted', N)], N), 'summary-visible')
check('condensing / summary-mount-failed', solve('condensing', [('summary-mount-failed', N)], N), 'individuals-visible')
check('summary-visible / inspect-burst', solve('summary-visible', [('inspect-burst', N)], N), 'expanding-details')
check('expanding-details / details-mounted', solve('expanding-details', [('details-mounted', N)], N), 'details-visible')
check('details-visible / collapse-details', solve('details-visible', [('collapse-details', N)], N), 'summary-visible')
check('summary-visible / new-burst-item', solve('summary-visible', [('new-burst-item', N)], N), 'summary-updating')
check('summary-updating / summary-update-mounted', solve('summary-updating', [('summary-update-mounted', N)], N), 'summary-visible')
check('expanding-details / close-before-mount', solve('expanding-details', [('close-before-mount', N)], N), 'closing-details')
check('closing-details / late-details-mounted', solve('closing-details', [('late-details-mounted', N)], N), 'summary-visible')
check('older notification incarnation', solve('individuals-visible', [('burst-detected', N - 1)], N), 'individuals-visible')
check('future notification incarnation', solve('individuals-visible', [('burst-detected', N + 1)], N), 'individuals-visible')
check('unknown event is inert', solve('individuals-visible', [('unknown-event', N)], N), 'individuals-visible')
check('empty delivery batch', solve('individuals-visible', [], N), 'individuals-visible')
check('N stale deliveries before current delivery', solve('individuals-visible', [('burst-detected', N - 1)] * N + [('burst-detected', N)], N), 'condensing')
check('trace burst-detected then summary-mounted', solve('individuals-visible', [('burst-detected', N), ('summary-mounted', N)], N), 'summary-visible')
check('trace burst-detected then summary-mount-failed', solve('individuals-visible', [('burst-detected', N), ('summary-mount-failed', N)], N), 'individuals-visible')
check('trace summary-mounted then inspect-burst', solve('condensing', [('summary-mounted', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace summary-mounted then new-burst-item', solve('condensing', [('summary-mounted', N), ('new-burst-item', N)], N), 'summary-updating')
check('trace summary-mount-failed then burst-detected', solve('condensing', [('summary-mount-failed', N), ('burst-detected', N)], N), 'condensing')
check('trace inspect-burst then details-mounted', solve('summary-visible', [('inspect-burst', N), ('details-mounted', N)], N), 'details-visible')
check('trace inspect-burst then close-before-mount', solve('summary-visible', [('inspect-burst', N), ('close-before-mount', N)], N), 'closing-details')
check('trace details-mounted then collapse-details', solve('expanding-details', [('details-mounted', N), ('collapse-details', N)], N), 'summary-visible')
check('trace collapse-details then inspect-burst', solve('details-visible', [('collapse-details', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace collapse-details then new-burst-item', solve('details-visible', [('collapse-details', N), ('new-burst-item', N)], N), 'summary-updating')
check('trace new-burst-item then summary-update-mounted', solve('summary-visible', [('new-burst-item', N), ('summary-update-mounted', N)], N), 'summary-visible')
check('trace summary-update-mounted then inspect-burst', solve('summary-updating', [('summary-update-mounted', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace summary-update-mounted then new-burst-item', solve('summary-updating', [('summary-update-mounted', N), ('new-burst-item', N)], N), 'summary-updating')
check('trace close-before-mount then late-details-mounted', solve('expanding-details', [('close-before-mount', N), ('late-details-mounted', N)], N), 'summary-visible')
check('trace late-details-mounted then inspect-burst', solve('closing-details', [('late-details-mounted', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace late-details-mounted then new-burst-item', solve('closing-details', [('late-details-mounted', N), ('new-burst-item', N)], N), 'summary-updating')
check('domain state regression 1: summary_members', solve('condensing', [('summary-mounted', N, {'mount': 2})], N, {}, 'summary_members'), {'phase': 'condensing', 'value': []})
check('domain state regression 2: summary_members', solve('condensing', [('summary-mounted', N, {})], N, {}, 'summary_members'), {'phase': 'summary-visible', 'value': ['a', 'b']})
check('domain state regression 3: items', solve('summary-visible', [('new-burst-item', N, {'item': 'a'})], N, {}, 'items'), {'phase': 'summary-updating', 'value': ['a', 'b']})
check('domain state regression 4: items', solve('summary-visible', [('new-burst-item', N, {'item': 'c'})], N, {}, 'items'), {'phase': 'summary-updating', 'value': ['a', 'b', 'c']})
check('domain state regression 5: detail_members', solve('expanding-details', [('details-mounted', N, {})], N, {}, 'detail_members'), {'phase': 'details-visible', 'value': ['a', 'b']})
check('domain state regression 6: detail_members', solve('closing-details', [('late-details-mounted', N, {})], N, {'detail_members': ['a', 'b']}, 'detail_members'), {'phase': 'summary-visible', 'value': []})
check('domain state regression 7: detail_members', solve('summary-visible', [('inspect-burst', N, {}), ('close-before-mount', N, {}), ('late-details-mounted', N, {})], N, {}, 'detail_members'), {'phase': 'summary-visible', 'value': []})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
individuals-visible / burst-detectedcondensingcondensingPassed
condensing / summary-mountedsummary-visiblesummary-visiblePassed
condensing / summary-mount-failedsummary-visibleindividuals-visibleFailed
summary-visible / inspect-burstexpanding-detailsexpanding-detailsPassed
expanding-details / details-mounteddetails-visibledetails-visiblePassed
details-visible / collapse-detailssummary-visiblesummary-visiblePassed
summary-visible / new-burst-itemsummary-updatingsummary-updatingPassed
summary-updating / summary-update-mountedsummary-visiblesummary-visiblePassed
expanding-details / close-before-mountclosing-detailsclosing-detailsPassed
closing-details / late-details-mountedsummary-visiblesummary-visiblePassed
older notification incarnationindividuals-visibleindividuals-visiblePassed
future notification incarnationindividuals-visibleindividuals-visiblePassed
unknown event is inertindividuals-visibleindividuals-visiblePassed
empty delivery batchindividuals-visibleindividuals-visiblePassed
N stale deliveries before current deliverycondensingcondensingPassed
trace burst-detected then summary-mountedsummary-visiblesummary-visiblePassed
trace burst-detected then summary-mount-failedsummary-visibleindividuals-visibleFailed
trace summary-mounted then inspect-burstexpanding-detailsexpanding-detailsPassed
trace summary-mounted then new-burst-itemsummary-updatingsummary-updatingPassed
trace summary-mount-failed then burst-detectedsummary-visiblecondensingFailed
trace inspect-burst then details-mounteddetails-visibledetails-visiblePassed
trace inspect-burst then close-before-mountclosing-detailsclosing-detailsPassed
trace details-mounted then collapse-detailssummary-visiblesummary-visiblePassed
trace collapse-details then inspect-burstexpanding-detailsexpanding-detailsPassed
trace collapse-details then new-burst-itemsummary-updatingsummary-updatingPassed
trace new-burst-item then summary-update-mountedsummary-visiblesummary-visiblePassed
trace summary-update-mounted then inspect-burstexpanding-detailsexpanding-detailsPassed
trace summary-update-mounted then new-burst-itemsummary-updatingsummary-updatingPassed
trace close-before-mount then late-details-mountedsummary-visiblesummary-visiblePassed
trace late-details-mounted then inspect-burstexpanding-detailsexpanding-detailsPassed
trace late-details-mounted then new-burst-itemsummary-updatingsummary-updatingPassed
domain state regression 1: summary_members{'phase': 'condensing', 'value': []}{'phase': 'condensing', 'value': []}Passed
domain state regression 2: summary_members{'phase': 'summary-visible', 'value': ['a', 'b']}{'phase': 'summary-visible', 'value': ['a', 'b']}Passed
domain state regression 3: items{'phase': 'summary-updating', 'value': ['a', 'b']}{'phase': 'summary-updating', 'value': ['a', 'b']}Passed
domain state regression 4: items{'phase': 'summary-updating', 'value': ['a', 'b', 'c']}{'phase': 'summary-updating', 'value': ['a', 'b', 'c']}Passed
domain state regression 5: detail_members{'phase': 'details-visible', 'value': ['a', 'b']}{'phase': 'details-visible', 'value': ['a', 'b']}Passed
domain state regression 6: detail_members{'phase': 'summary-visible', 'value': []}{'phase': 'summary-visible', 'value': []}Passed
domain state regression 7: detail_members{'phase': 'summary-visible', 'value': []}{'phase': 'summary-visible', 'value': []}Passed

SHA-256 / f6cd3aa24e774f31dd7fb3942d8acfb8566fbee66df7badcaef71164fcfc1ca8

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(initial, events, generation, payload=None, observe=None):
    table = {('individuals-visible', 'burst-detected'): 'condensing', ('condensing', 'summary-mounted'): 'summary-visible', ('condensing', 'summary-mount-failed'): 'empty', ('summary-visible', 'inspect-burst'): 'expanding-details', ('expanding-details', 'details-mounted'): 'details-visible', ('details-visible', 'collapse-details'): 'summary-visible', ('summary-visible', 'new-burst-item'): 'summary-updating', ('summary-updating', 'summary-update-mounted'): 'summary-visible', ('expanding-details', 'close-before-mount'): 'closing-details', ('closing-details', 'late-details-mounted'): 'summary-visible'}
    data = json.loads(json.dumps({'items': ['a', 'b'], 'summary_members': [], 'detail_members': [], 'mount': 3})) if payload is None else {**json.loads(json.dumps({'items': ['a', 'b'], 'summary_members': [], 'detail_members': [], 'mount': 3})), **json.loads(json.dumps(payload))}
    state = initial
    for delivery in events:
        event, event_generation = delivery[:2]
        arg = delivery[2] if len(delivery) > 2 else {}
        if event_generation == generation:
            previous = state
            if event in ('summary-mounted','details-mounted','late-details-mounted','summary-update-mounted') and arg.get('mount',data['mount']) != data['mount']: event = 'unknown-event'
            if event == 'new-burst-item' and arg.get('item','c') not in data['items']: data['items'].append(arg.get('item','c'))
            state = table.get((state, event), state)
            if state == 'summary-visible':
                data['summary_members'] = data['items'][:]
                data['detail_members'] = []
            if state == 'details-visible': data['detail_members'] = data['items'][:]
            if state == 'empty': data['summary_members'] = []; data['detail_members'] = []
    return {'phase': state, 'value': data[observe]} if observe else state
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('individuals-visible / burst-detected', solve('individuals-visible', [('burst-detected', N)], N), 'condensing')
check('condensing / summary-mounted', solve('condensing', [('summary-mounted', N)], N), 'summary-visible')
check('condensing / summary-mount-failed', solve('condensing', [('summary-mount-failed', N)], N), 'individuals-visible')
check('summary-visible / inspect-burst', solve('summary-visible', [('inspect-burst', N)], N), 'expanding-details')
check('expanding-details / details-mounted', solve('expanding-details', [('details-mounted', N)], N), 'details-visible')
check('details-visible / collapse-details', solve('details-visible', [('collapse-details', N)], N), 'summary-visible')
check('summary-visible / new-burst-item', solve('summary-visible', [('new-burst-item', N)], N), 'summary-updating')
check('summary-updating / summary-update-mounted', solve('summary-updating', [('summary-update-mounted', N)], N), 'summary-visible')
check('expanding-details / close-before-mount', solve('expanding-details', [('close-before-mount', N)], N), 'closing-details')
check('closing-details / late-details-mounted', solve('closing-details', [('late-details-mounted', N)], N), 'summary-visible')
check('older notification incarnation', solve('individuals-visible', [('burst-detected', N - 1)], N), 'individuals-visible')
check('future notification incarnation', solve('individuals-visible', [('burst-detected', N + 1)], N), 'individuals-visible')
check('unknown event is inert', solve('individuals-visible', [('unknown-event', N)], N), 'individuals-visible')
check('empty delivery batch', solve('individuals-visible', [], N), 'individuals-visible')
check('N stale deliveries before current delivery', solve('individuals-visible', [('burst-detected', N - 1)] * N + [('burst-detected', N)], N), 'condensing')
check('trace burst-detected then summary-mounted', solve('individuals-visible', [('burst-detected', N), ('summary-mounted', N)], N), 'summary-visible')
check('trace burst-detected then summary-mount-failed', solve('individuals-visible', [('burst-detected', N), ('summary-mount-failed', N)], N), 'individuals-visible')
check('trace summary-mounted then inspect-burst', solve('condensing', [('summary-mounted', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace summary-mounted then new-burst-item', solve('condensing', [('summary-mounted', N), ('new-burst-item', N)], N), 'summary-updating')
check('trace summary-mount-failed then burst-detected', solve('condensing', [('summary-mount-failed', N), ('burst-detected', N)], N), 'condensing')
check('trace inspect-burst then details-mounted', solve('summary-visible', [('inspect-burst', N), ('details-mounted', N)], N), 'details-visible')
check('trace inspect-burst then close-before-mount', solve('summary-visible', [('inspect-burst', N), ('close-before-mount', N)], N), 'closing-details')
check('trace details-mounted then collapse-details', solve('expanding-details', [('details-mounted', N), ('collapse-details', N)], N), 'summary-visible')
check('trace collapse-details then inspect-burst', solve('details-visible', [('collapse-details', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace collapse-details then new-burst-item', solve('details-visible', [('collapse-details', N), ('new-burst-item', N)], N), 'summary-updating')
check('trace new-burst-item then summary-update-mounted', solve('summary-visible', [('new-burst-item', N), ('summary-update-mounted', N)], N), 'summary-visible')
check('trace summary-update-mounted then inspect-burst', solve('summary-updating', [('summary-update-mounted', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace summary-update-mounted then new-burst-item', solve('summary-updating', [('summary-update-mounted', N), ('new-burst-item', N)], N), 'summary-updating')
check('trace close-before-mount then late-details-mounted', solve('expanding-details', [('close-before-mount', N), ('late-details-mounted', N)], N), 'summary-visible')
check('trace late-details-mounted then inspect-burst', solve('closing-details', [('late-details-mounted', N), ('inspect-burst', N)], N), 'expanding-details')
check('trace late-details-mounted then new-burst-item', solve('closing-details', [('late-details-mounted', N), ('new-burst-item', N)], N), 'summary-updating')
check('domain state regression 1: summary_members', solve('condensing', [('summary-mounted', N, {'mount': 2})], N, {}, 'summary_members'), {'phase': 'condensing', 'value': []})
check('domain state regression 2: summary_members', solve('condensing', [('summary-mounted', N, {})], N, {}, 'summary_members'), {'phase': 'summary-visible', 'value': ['a', 'b']})
check('domain state regression 3: items', solve('summary-visible', [('new-burst-item', N, {'item': 'a'})], N, {}, 'items'), {'phase': 'summary-updating', 'value': ['a', 'b']})
check('domain state regression 4: items', solve('summary-visible', [('new-burst-item', N, {'item': 'c'})], N, {}, 'items'), {'phase': 'summary-updating', 'value': ['a', 'b', 'c']})
check('domain state regression 5: detail_members', solve('expanding-details', [('details-mounted', N, {})], N, {}, 'detail_members'), {'phase': 'details-visible', 'value': ['a', 'b']})
check('domain state regression 6: detail_members', solve('closing-details', [('late-details-mounted', N, {})], N, {'detail_members': ['a', 'b']}, 'detail_members'), {'phase': 'summary-visible', 'value': []})
check('domain state regression 7: detail_members', solve('summary-visible', [('inspect-burst', N, {}), ('close-before-mount', N, {}), ('late-details-mounted', N, {})], N, {}, 'detail_members'), {'phase': 'summary-visible', 'value': []})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
individuals-visible / burst-detectedcondensingcondensingPassed
condensing / summary-mountedsummary-visiblesummary-visiblePassed
condensing / summary-mount-failedemptyindividuals-visibleFailed
summary-visible / inspect-burstexpanding-detailsexpanding-detailsPassed
expanding-details / details-mounteddetails-visibledetails-visiblePassed
details-visible / collapse-detailssummary-visiblesummary-visiblePassed
summary-visible / new-burst-itemsummary-updatingsummary-updatingPassed
summary-updating / summary-update-mountedsummary-visiblesummary-visiblePassed
expanding-details / close-before-mountclosing-detailsclosing-detailsPassed
closing-details / late-details-mountedsummary-visiblesummary-visiblePassed
older notification incarnationindividuals-visibleindividuals-visiblePassed
future notification incarnationindividuals-visibleindividuals-visiblePassed
unknown event is inertindividuals-visibleindividuals-visiblePassed
empty delivery batchindividuals-visibleindividuals-visiblePassed
N stale deliveries before current deliverycondensingcondensingPassed
trace burst-detected then summary-mountedsummary-visiblesummary-visiblePassed
trace burst-detected then summary-mount-failedemptyindividuals-visibleFailed
trace summary-mounted then inspect-burstexpanding-detailsexpanding-detailsPassed
trace summary-mounted then new-burst-itemsummary-updatingsummary-updatingPassed
trace summary-mount-failed then burst-detectedemptycondensingFailed
trace inspect-burst then details-mounteddetails-visibledetails-visiblePassed
trace inspect-burst then close-before-mountclosing-detailsclosing-detailsPassed
trace details-mounted then collapse-detailssummary-visiblesummary-visiblePassed
trace collapse-details then inspect-burstexpanding-detailsexpanding-detailsPassed
trace collapse-details then new-burst-itemsummary-updatingsummary-updatingPassed
trace new-burst-item then summary-update-mountedsummary-visiblesummary-visiblePassed
trace summary-update-mounted then inspect-burstexpanding-detailsexpanding-detailsPassed
trace summary-update-mounted then new-burst-itemsummary-updatingsummary-updatingPassed
trace close-before-mount then late-details-mountedsummary-visiblesummary-visiblePassed
trace late-details-mounted then inspect-burstexpanding-detailsexpanding-detailsPassed
trace late-details-mounted then new-burst-itemsummary-updatingsummary-updatingPassed
domain state regression 1: summary_members{'phase': 'condensing', 'value': []}{'phase': 'condensing', 'value': []}Passed
domain state regression 2: summary_members{'phase': 'summary-visible', 'value': ['a', 'b']}{'phase': 'summary-visible', 'value': ['a', 'b']}Passed
domain state regression 3: items{'phase': 'summary-updating', 'value': ['a', 'b']}{'phase': 'summary-updating', 'value': ['a', 'b']}Passed
domain state regression 4: items{'phase': 'summary-updating', 'value': ['a', 'b', 'c']}{'phase': 'summary-updating', 'value': ['a', 'b', 'c']}Passed
domain state regression 5: detail_members{'phase': 'details-visible', 'value': ['a', 'b']}{'phase': 'details-visible', 'value': ['a', 'b']}Passed
domain state regression 6: detail_members{'phase': 'summary-visible', 'value': []}{'phase': 'summary-visible', 'value': []}Passed
domain state regression 7: detail_members{'phase': 'summary-visible', 'value': []}{'phase': 'summary-visible', 'value': []}Passed

SHA-256 / 323e2395f4a832fbdb939948c34659e660e393f169057bde8ede4866b3b6be19

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This mechanism has 38 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

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Verification & scope

Stipulated single-notification state and policy model only. Event delivery and acknowledgements are explicit test inputs. No DOM, accessibility announcements, live timers, networking, actual rendering, or production-platform conformance is simulated. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:42:39.577689+00:00.

Case digest / c26c4e069b2b16239c30557e56bdae3131e2ddd53b1c7b6c6d9a87af872d4776