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FA-34966 / Notification interfaces / Open access

Notification content revision review: ack-revision from revision-three-preview · case 01

The ack-revision event leaves a notification in revision-two-read instead of revision-three-read.

Verified by executionVariant 1 · 33 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Acknowledgement is saved for the wrong revision.

THE FAILURE

Acknowledgement is saved for the wrong revision.

Unsuccessful approach: Returning to pending review fails to record the explicit acknowledgement.

Case contract

Notification content revision review is a bounded visual-notification workflow with mutable policy state {'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False}. Its default transition relation is {('revision-one-read', 'revision-two-arrives'): 'revision-two-unread', ('revision-two-unread', 'open-revision'): 'revision-two-preview', ('revision-two-preview', 'ack-revision'): 'revision-two-read', ('revision-two-preview', 'revision-three-arrives'): 'revision-three-pending-review', ('revision-three-pending-review', 'accept-update'): 'revision-three-preview', ('revision-three-preview', 'ack-revision'): 'revision-three-read', ('revision-three-read', 'late-revision-two'): 'revision-three-read', ('revision-three-pending-review', 'close-preview'): 'revision-three-unread', ('revision-three-unread', 'open-revision'): 'revision-three-preview', ('revision-two-unread', 'revision-withdrawn'): 'withdrawn'}; domain inputs can suppress or redirect transitions and update policy fields, as specified in solve.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 = {('revision-one-read', 'revision-two-arrives'): 'revision-two-unread', ('revision-two-unread', 'open-revision'): 'revision-two-preview', ('revision-two-preview', 'ack-revision'): 'revision-two-read', ('revision-two-preview', 'revision-three-arrives'): 'revision-three-pending-review', ('revision-three-pending-review', 'accept-update'): 'revision-three-preview', ('revision-three-preview', 'ack-revision'): 'revision-two-read', ('revision-three-read', 'late-revision-two'): 'revision-three-read', ('revision-three-pending-review', 'close-preview'): 'revision-three-unread', ('revision-three-unread', 'open-revision'): 'revision-three-preview', ('revision-two-unread', 'revision-withdrawn'): 'withdrawn'}
    data = json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})) if payload is None else {**json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})), **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 == 'ack-revision' and arg.get('revision',data['current']) != data['current']: event = 'unknown-event'
            if event == 'revision-three-arrives': data['current'] = 3
            state = table.get((state, event), state)
            if state in ('revision-two-preview','revision-three-preview'): data['preview'] = data['current']
            if state == 'revision-two-read': data['ack'] = 2
            if state == 'revision-three-read': data['ack'] = 3
            if state == 'withdrawn':
                data['withdrawn'] = True
                data['preview'] = None
    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('revision-one-read / revision-two-arrives', solve('revision-one-read', [('revision-two-arrives', N)], N), 'revision-two-unread')
check('revision-two-unread / open-revision', solve('revision-two-unread', [('open-revision', N)], N), 'revision-two-preview')
check('revision-two-preview / ack-revision', solve('revision-two-preview', [('ack-revision', N)], N), 'revision-two-read')
check('revision-two-preview / revision-three-arrives', solve('revision-two-preview', [('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('revision-three-pending-review / accept-update', solve('revision-three-pending-review', [('accept-update', N)], N), 'revision-three-preview')
check('revision-three-preview / ack-revision', solve('revision-three-preview', [('ack-revision', N)], N), 'revision-three-read')
check('revision-three-read / late-revision-two', solve('revision-three-read', [('late-revision-two', N)], N), 'revision-three-read')
check('revision-three-pending-review / close-preview', solve('revision-three-pending-review', [('close-preview', N)], N), 'revision-three-unread')
check('revision-three-unread / open-revision', solve('revision-three-unread', [('open-revision', N)], N), 'revision-three-preview')
check('revision-two-unread / revision-withdrawn', solve('revision-two-unread', [('revision-withdrawn', N)], N), 'withdrawn')
check('older notification incarnation', solve('revision-one-read', [('revision-two-arrives', N - 1)], N), 'revision-one-read')
check('future notification incarnation', solve('revision-one-read', [('revision-two-arrives', N + 1)], N), 'revision-one-read')
check('unknown event is inert', solve('revision-one-read', [('unknown-event', N)], N), 'revision-one-read')
check('empty delivery batch', solve('revision-one-read', [], N), 'revision-one-read')
check('N stale deliveries before current delivery', solve('revision-one-read', [('revision-two-arrives', N - 1)] * N + [('revision-two-arrives', N)], N), 'revision-two-unread')
check('trace revision-two-arrives then open-revision', solve('revision-one-read', [('revision-two-arrives', N), ('open-revision', N)], N), 'revision-two-preview')
check('trace revision-two-arrives then revision-withdrawn', solve('revision-one-read', [('revision-two-arrives', N), ('revision-withdrawn', N)], N), 'withdrawn')
check('trace open-revision then ack-revision', solve('revision-two-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-two-read')
check('trace open-revision then revision-three-arrives', solve('revision-two-unread', [('open-revision', N), ('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('trace revision-three-arrives then accept-update', solve('revision-two-preview', [('revision-three-arrives', N), ('accept-update', N)], N), 'revision-three-preview')
check('trace revision-three-arrives then close-preview', solve('revision-two-preview', [('revision-three-arrives', N), ('close-preview', N)], N), 'revision-three-unread')
check('trace accept-update then ack-revision', solve('revision-three-pending-review', [('accept-update', N), ('ack-revision', N)], N), 'revision-three-read')
check('trace ack-revision then late-revision-two', solve('revision-three-preview', [('ack-revision', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace late-revision-two then late-revision-two', solve('revision-three-read', [('late-revision-two', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace close-preview then open-revision', solve('revision-three-pending-review', [('close-preview', N), ('open-revision', N)], N), 'revision-three-preview')
check('trace open-revision then ack-revision', solve('revision-three-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-three-read')
check('domain state regression 1: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 1})], N, {}, 'ack'), {'phase': 'revision-two-preview', 'value': 1})
check('domain state regression 2: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 2})], N, {}, 'ack'), {'phase': 'revision-two-read', 'value': 2})
check('domain state regression 3: preview', solve('revision-two-preview', [('revision-three-arrives', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'revision-three-pending-review', 'value': 2})
check('domain state regression 4: preview', solve('revision-three-pending-review', [('accept-update', N, {})], N, {'current': 3, 'preview': 2}, 'preview'), {'phase': 'revision-three-preview', 'value': 3})
check('domain state regression 5: current', solve('revision-three-read', [('late-revision-two', N, {})], N, {'current': 3, 'ack': 3}, 'current'), {'phase': 'revision-three-read', 'value': 3})
check('domain state regression 6: preview', solve('revision-two-unread', [('revision-withdrawn', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'withdrawn', 'value': None})
check('domain state regression 7: ack', solve('revision-two-preview', [('revision-three-arrives', N, {}), ('accept-update', N, {}), ('ack-revision', N, {'revision': 2}), ('ack-revision', N, {'revision': 3})], N, {}, 'ack'), {'phase': 'revision-three-read', 'value': 3})
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
revision-one-read / revision-two-arrivesrevision-two-unreadrevision-two-unreadPassed
revision-two-unread / open-revisionrevision-two-previewrevision-two-previewPassed
revision-two-preview / ack-revisionrevision-two-readrevision-two-readPassed
revision-two-preview / revision-three-arrivesrevision-three-pending-reviewrevision-three-pending-reviewPassed
revision-three-pending-review / accept-updaterevision-three-previewrevision-three-previewPassed
revision-three-preview / ack-revisionrevision-two-readrevision-three-readFailed
revision-three-read / late-revision-tworevision-three-readrevision-three-readPassed
revision-three-pending-review / close-previewrevision-three-unreadrevision-three-unreadPassed
revision-three-unread / open-revisionrevision-three-previewrevision-three-previewPassed
revision-two-unread / revision-withdrawnwithdrawnwithdrawnPassed
older notification incarnationrevision-one-readrevision-one-readPassed
future notification incarnationrevision-one-readrevision-one-readPassed
unknown event is inertrevision-one-readrevision-one-readPassed
empty delivery batchrevision-one-readrevision-one-readPassed
N stale deliveries before current deliveryrevision-two-unreadrevision-two-unreadPassed
trace revision-two-arrives then open-revisionrevision-two-previewrevision-two-previewPassed
trace revision-two-arrives then revision-withdrawnwithdrawnwithdrawnPassed
trace open-revision then ack-revisionrevision-two-readrevision-two-readPassed
trace open-revision then revision-three-arrivesrevision-three-pending-reviewrevision-three-pending-reviewPassed
trace revision-three-arrives then accept-updaterevision-three-previewrevision-three-previewPassed
trace revision-three-arrives then close-previewrevision-three-unreadrevision-three-unreadPassed
trace accept-update then ack-revisionrevision-two-readrevision-three-readFailed
trace ack-revision then late-revision-tworevision-two-readrevision-three-readFailed
trace late-revision-two then late-revision-tworevision-three-readrevision-three-readPassed
trace close-preview then open-revisionrevision-three-previewrevision-three-previewPassed
trace open-revision then ack-revisionrevision-two-readrevision-three-readFailed
domain state regression 1: ack{'phase': 'revision-two-preview', 'value': 1}{'phase': 'revision-two-preview', 'value': 1}Passed
domain state regression 2: ack{'phase': 'revision-two-read', 'value': 2}{'phase': 'revision-two-read', 'value': 2}Passed
domain state regression 3: preview{'phase': 'revision-three-pending-review', 'value': 2}{'phase': 'revision-three-pending-review', 'value': 2}Passed
domain state regression 4: preview{'phase': 'revision-three-preview', 'value': 3}{'phase': 'revision-three-preview', 'value': 3}Passed
domain state regression 5: current{'phase': 'revision-three-read', 'value': 3}{'phase': 'revision-three-read', 'value': 3}Passed
domain state regression 6: preview{'phase': 'withdrawn', 'value': None}{'phase': 'withdrawn', 'value': None}Passed
domain state regression 7: ack{'phase': 'revision-two-read', 'value': 2}{'phase': 'revision-three-read', 'value': 3}Failed

SHA-256 / 7156a10eda954e60665b5cdf1fa358cf73c08dd0866b34d3b062da387dbe5c41

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 = {('revision-one-read', 'revision-two-arrives'): 'revision-two-unread', ('revision-two-unread', 'open-revision'): 'revision-two-preview', ('revision-two-preview', 'ack-revision'): 'revision-two-read', ('revision-two-preview', 'revision-three-arrives'): 'revision-three-pending-review', ('revision-three-pending-review', 'accept-update'): 'revision-three-preview', ('revision-three-preview', 'ack-revision'): 'revision-three-pending-review', ('revision-three-read', 'late-revision-two'): 'revision-three-read', ('revision-three-pending-review', 'close-preview'): 'revision-three-unread', ('revision-three-unread', 'open-revision'): 'revision-three-preview', ('revision-two-unread', 'revision-withdrawn'): 'withdrawn'}
    data = json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})) if payload is None else {**json.loads(json.dumps({'current': 2, 'ack': 1, 'preview': None, 'withdrawn': False})), **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 == 'ack-revision' and arg.get('revision',data['current']) != data['current']: event = 'unknown-event'
            if event == 'revision-three-arrives': data['current'] = 3
            state = table.get((state, event), state)
            if state in ('revision-two-preview','revision-three-preview'): data['preview'] = data['current']
            if state == 'revision-two-read': data['ack'] = 2
            if state == 'revision-three-read': data['ack'] = 3
            if state == 'withdrawn':
                data['withdrawn'] = True
                data['preview'] = None
    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('revision-one-read / revision-two-arrives', solve('revision-one-read', [('revision-two-arrives', N)], N), 'revision-two-unread')
check('revision-two-unread / open-revision', solve('revision-two-unread', [('open-revision', N)], N), 'revision-two-preview')
check('revision-two-preview / ack-revision', solve('revision-two-preview', [('ack-revision', N)], N), 'revision-two-read')
check('revision-two-preview / revision-three-arrives', solve('revision-two-preview', [('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('revision-three-pending-review / accept-update', solve('revision-three-pending-review', [('accept-update', N)], N), 'revision-three-preview')
check('revision-three-preview / ack-revision', solve('revision-three-preview', [('ack-revision', N)], N), 'revision-three-read')
check('revision-three-read / late-revision-two', solve('revision-three-read', [('late-revision-two', N)], N), 'revision-three-read')
check('revision-three-pending-review / close-preview', solve('revision-three-pending-review', [('close-preview', N)], N), 'revision-three-unread')
check('revision-three-unread / open-revision', solve('revision-three-unread', [('open-revision', N)], N), 'revision-three-preview')
check('revision-two-unread / revision-withdrawn', solve('revision-two-unread', [('revision-withdrawn', N)], N), 'withdrawn')
check('older notification incarnation', solve('revision-one-read', [('revision-two-arrives', N - 1)], N), 'revision-one-read')
check('future notification incarnation', solve('revision-one-read', [('revision-two-arrives', N + 1)], N), 'revision-one-read')
check('unknown event is inert', solve('revision-one-read', [('unknown-event', N)], N), 'revision-one-read')
check('empty delivery batch', solve('revision-one-read', [], N), 'revision-one-read')
check('N stale deliveries before current delivery', solve('revision-one-read', [('revision-two-arrives', N - 1)] * N + [('revision-two-arrives', N)], N), 'revision-two-unread')
check('trace revision-two-arrives then open-revision', solve('revision-one-read', [('revision-two-arrives', N), ('open-revision', N)], N), 'revision-two-preview')
check('trace revision-two-arrives then revision-withdrawn', solve('revision-one-read', [('revision-two-arrives', N), ('revision-withdrawn', N)], N), 'withdrawn')
check('trace open-revision then ack-revision', solve('revision-two-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-two-read')
check('trace open-revision then revision-three-arrives', solve('revision-two-unread', [('open-revision', N), ('revision-three-arrives', N)], N), 'revision-three-pending-review')
check('trace revision-three-arrives then accept-update', solve('revision-two-preview', [('revision-three-arrives', N), ('accept-update', N)], N), 'revision-three-preview')
check('trace revision-three-arrives then close-preview', solve('revision-two-preview', [('revision-three-arrives', N), ('close-preview', N)], N), 'revision-three-unread')
check('trace accept-update then ack-revision', solve('revision-three-pending-review', [('accept-update', N), ('ack-revision', N)], N), 'revision-three-read')
check('trace ack-revision then late-revision-two', solve('revision-three-preview', [('ack-revision', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace late-revision-two then late-revision-two', solve('revision-three-read', [('late-revision-two', N), ('late-revision-two', N)], N), 'revision-three-read')
check('trace close-preview then open-revision', solve('revision-three-pending-review', [('close-preview', N), ('open-revision', N)], N), 'revision-three-preview')
check('trace open-revision then ack-revision', solve('revision-three-unread', [('open-revision', N), ('ack-revision', N)], N), 'revision-three-read')
check('domain state regression 1: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 1})], N, {}, 'ack'), {'phase': 'revision-two-preview', 'value': 1})
check('domain state regression 2: ack', solve('revision-two-preview', [('ack-revision', N, {'revision': 2})], N, {}, 'ack'), {'phase': 'revision-two-read', 'value': 2})
check('domain state regression 3: preview', solve('revision-two-preview', [('revision-three-arrives', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'revision-three-pending-review', 'value': 2})
check('domain state regression 4: preview', solve('revision-three-pending-review', [('accept-update', N, {})], N, {'current': 3, 'preview': 2}, 'preview'), {'phase': 'revision-three-preview', 'value': 3})
check('domain state regression 5: current', solve('revision-three-read', [('late-revision-two', N, {})], N, {'current': 3, 'ack': 3}, 'current'), {'phase': 'revision-three-read', 'value': 3})
check('domain state regression 6: preview', solve('revision-two-unread', [('revision-withdrawn', N, {})], N, {'preview': 2}, 'preview'), {'phase': 'withdrawn', 'value': None})
check('domain state regression 7: ack', solve('revision-two-preview', [('revision-three-arrives', N, {}), ('accept-update', N, {}), ('ack-revision', N, {'revision': 2}), ('ack-revision', N, {'revision': 3})], N, {}, 'ack'), {'phase': 'revision-three-read', 'value': 3})
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
revision-one-read / revision-two-arrivesrevision-two-unreadrevision-two-unreadPassed
revision-two-unread / open-revisionrevision-two-previewrevision-two-previewPassed
revision-two-preview / ack-revisionrevision-two-readrevision-two-readPassed
revision-two-preview / revision-three-arrivesrevision-three-pending-reviewrevision-three-pending-reviewPassed
revision-three-pending-review / accept-updaterevision-three-previewrevision-three-previewPassed
revision-three-preview / ack-revisionrevision-three-pending-reviewrevision-three-readFailed
revision-three-read / late-revision-tworevision-three-readrevision-three-readPassed
revision-three-pending-review / close-previewrevision-three-unreadrevision-three-unreadPassed
revision-three-unread / open-revisionrevision-three-previewrevision-three-previewPassed
revision-two-unread / revision-withdrawnwithdrawnwithdrawnPassed
older notification incarnationrevision-one-readrevision-one-readPassed
future notification incarnationrevision-one-readrevision-one-readPassed
unknown event is inertrevision-one-readrevision-one-readPassed
empty delivery batchrevision-one-readrevision-one-readPassed
N stale deliveries before current deliveryrevision-two-unreadrevision-two-unreadPassed
trace revision-two-arrives then open-revisionrevision-two-previewrevision-two-previewPassed
trace revision-two-arrives then revision-withdrawnwithdrawnwithdrawnPassed
trace open-revision then ack-revisionrevision-two-readrevision-two-readPassed
trace open-revision then revision-three-arrivesrevision-three-pending-reviewrevision-three-pending-reviewPassed
trace revision-three-arrives then accept-updaterevision-three-previewrevision-three-previewPassed
trace revision-three-arrives then close-previewrevision-three-unreadrevision-three-unreadPassed
trace accept-update then ack-revisionrevision-three-pending-reviewrevision-three-readFailed
trace ack-revision then late-revision-tworevision-three-pending-reviewrevision-three-readFailed
trace late-revision-two then late-revision-tworevision-three-readrevision-three-readPassed
trace close-preview then open-revisionrevision-three-previewrevision-three-previewPassed
trace open-revision then ack-revisionrevision-three-pending-reviewrevision-three-readFailed
domain state regression 1: ack{'phase': 'revision-two-preview', 'value': 1}{'phase': 'revision-two-preview', 'value': 1}Passed
domain state regression 2: ack{'phase': 'revision-two-read', 'value': 2}{'phase': 'revision-two-read', 'value': 2}Passed
domain state regression 3: preview{'phase': 'revision-three-pending-review', 'value': 2}{'phase': 'revision-three-pending-review', 'value': 2}Passed
domain state regression 4: preview{'phase': 'revision-three-preview', 'value': 3}{'phase': 'revision-three-preview', 'value': 3}Passed
domain state regression 5: current{'phase': 'revision-three-read', 'value': 3}{'phase': 'revision-three-read', 'value': 3}Passed
domain state regression 6: preview{'phase': 'withdrawn', 'value': None}{'phase': 'withdrawn', 'value': None}Passed
domain state regression 7: ack{'phase': 'revision-three-pending-review', 'value': 1}{'phase': 'revision-three-read', 'value': 3}Failed

SHA-256 / 6cbf0ee89651260f7df0980140f410f91820061c40842c1ce3eae125fee2e22a

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This mechanism has 33 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 2026-09-29T14:42:37.244719+00:00.

Case digest / b894907ea0874a4e1e168237b26557f175f272dee1b685abba0b1ca3a57a32c7