FAILURE MAP
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FA-34331 / Notification interfaces / Open access

Notification digest assembly presentation: late-item from sealing · case 01

The late-item event leaves a notification in collecting instead of sealing.

Verified by executionVariant 1 · 35 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

A late item reopens a closed membership window.

THE FAILURE

A late item reopens a closed membership window.

Unsuccessful approach: Publishing to avoid reopening still bypasses seal acknowledgement.

Case contract

Notification digest assembly presentation is a bounded visual-notification workflow with mutable policy state {'members': ['a', 'b'], 'sealed': [], 'next_window': [], 'shown': []}. Its default transition relation is {('collecting', 'close-window'): 'sealing', ('sealing', 'seal-success'): 'ready', ('ready', 'show-digest'): 'publishing', ('publishing', 'paint-success'): 'published', ('publishing', 'paint-failure'): 'publish-error', ('publish-error', 'retry-show'): 'publishing', ('published', 'expand-digest'): 'expanded', ('expanded', 'collapse-digest'): 'published', ('sealing', 'late-item'): 'sealing', ('collecting', 'close-empty-window'): 'empty'}; 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 = {('collecting', 'close-window'): 'sealing', ('sealing', 'seal-success'): 'ready', ('ready', 'show-digest'): 'publishing', ('publishing', 'paint-success'): 'published', ('publishing', 'paint-failure'): 'publish-error', ('publish-error', 'retry-show'): 'publishing', ('published', 'expand-digest'): 'expanded', ('expanded', 'collapse-digest'): 'published', ('sealing', 'late-item'): 'collecting', ('collecting', 'close-empty-window'): 'empty'}
    data = json.loads(json.dumps({'members': ['a', 'b'], 'sealed': [], 'next_window': [], 'shown': []})) if payload is None else {**json.loads(json.dumps({'members': ['a', 'b'], 'sealed': [], 'next_window': [], 'shown': []})), **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 == 'close-empty-window' and data['members']: event = 'close-window'
            if event == 'late-item': data['next_window'].append(arg.get('item','late'))
            if event == 'seal-success': data['sealed'] = data['members'][:]
            state = table.get((state, event), state)
            if state == 'published': data['shown'] = data['sealed'][:]
            if state == 'empty': data['shown'] = []
    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('collecting / close-window', solve('collecting', [('close-window', N)], N), 'sealing')
check('sealing / seal-success', solve('sealing', [('seal-success', N)], N), 'ready')
check('ready / show-digest', solve('ready', [('show-digest', N)], N), 'publishing')
check('publishing / paint-success', solve('publishing', [('paint-success', N)], N), 'published')
check('publishing / paint-failure', solve('publishing', [('paint-failure', N)], N), 'publish-error')
check('publish-error / retry-show', solve('publish-error', [('retry-show', N)], N), 'publishing')
check('published / expand-digest', solve('published', [('expand-digest', N)], N), 'expanded')
check('expanded / collapse-digest', solve('expanded', [('collapse-digest', N)], N), 'published')
check('sealing / late-item', solve('sealing', [('late-item', N)], N), 'sealing')
check('collecting / close-empty-window', solve('collecting', [('close-empty-window', N)], N, {'members': []}), 'empty')
check('older notification incarnation', solve('collecting', [('close-window', N - 1)], N), 'collecting')
check('future notification incarnation', solve('collecting', [('close-window', N + 1)], N), 'collecting')
check('unknown event is inert', solve('collecting', [('unknown-event', N)], N), 'collecting')
check('empty delivery batch', solve('collecting', [], N), 'collecting')
check('N stale deliveries before current delivery', solve('collecting', [('close-window', N - 1)] * N + [('close-window', N)], N), 'sealing')
check('trace close-window then seal-success', solve('collecting', [('close-window', N), ('seal-success', N)], N), 'ready')
check('trace close-window then late-item', solve('collecting', [('close-window', N), ('late-item', N)], N), 'sealing')
check('trace seal-success then show-digest', solve('sealing', [('seal-success', N), ('show-digest', N)], N), 'publishing')
check('trace show-digest then paint-success', solve('ready', [('show-digest', N), ('paint-success', N)], N), 'published')
check('trace show-digest then paint-failure', solve('ready', [('show-digest', N), ('paint-failure', N)], N), 'publish-error')
check('trace paint-success then expand-digest', solve('publishing', [('paint-success', N), ('expand-digest', N)], N), 'expanded')
check('trace paint-failure then retry-show', solve('publishing', [('paint-failure', N), ('retry-show', N)], N), 'publishing')
check('trace retry-show then paint-success', solve('publish-error', [('retry-show', N), ('paint-success', N)], N), 'published')
check('trace retry-show then paint-failure', solve('publish-error', [('retry-show', N), ('paint-failure', N)], N), 'publish-error')
check('trace expand-digest then collapse-digest', solve('published', [('expand-digest', N), ('collapse-digest', N)], N), 'published')
check('trace collapse-digest then expand-digest', solve('expanded', [('collapse-digest', N), ('expand-digest', N)], N), 'expanded')
check('trace late-item then seal-success', solve('sealing', [('late-item', N), ('seal-success', N)], N), 'ready')
check('trace late-item then late-item', solve('sealing', [('late-item', N), ('late-item', N)], N), 'sealing')
check('domain state regression 1: members', solve('collecting', [('close-empty-window', N, {})], N, {}, 'members'), {'phase': 'sealing', 'value': ['a', 'b']})
check('domain state regression 2: shown', solve('collecting', [('close-empty-window', N, {})], N, {'members': []}, 'shown'), {'phase': 'empty', 'value': []})
check('domain state regression 3: sealed', solve('sealing', [('seal-success', N, {})], N, {}, 'sealed'), {'phase': 'ready', 'value': ['a', 'b']})
check('domain state regression 4: members', solve('sealing', [('late-item', N, {'item': 'c'})], N, {}, 'members'), {'phase': 'sealing', 'value': ['a', 'b']})
check('domain state regression 5: next_window', solve('sealing', [('late-item', N, {'item': 'c'})], N, {}, 'next_window'), {'phase': 'sealing', 'value': ['c']})
check('domain state regression 6: shown', solve('publishing', [('paint-success', N, {})], N, {'sealed': ['a']}, 'shown'), {'phase': 'published', 'value': ['a']})
check('domain state regression 7: shown', solve('collecting', [('close-window', N, {}), ('late-item', N, {'item': 'c'}), ('seal-success', N, {}), ('show-digest', N, {}), ('paint-success', N, {})], N, {}, 'shown'), {'phase': 'published', 'value': ['a', 'b']})
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
collecting / close-windowsealingsealingPassed
sealing / seal-successreadyreadyPassed
ready / show-digestpublishingpublishingPassed
publishing / paint-successpublishedpublishedPassed
publishing / paint-failurepublish-errorpublish-errorPassed
publish-error / retry-showpublishingpublishingPassed
published / expand-digestexpandedexpandedPassed
expanded / collapse-digestpublishedpublishedPassed
sealing / late-itemcollectingsealingFailed
collecting / close-empty-windowemptyemptyPassed
older notification incarnationcollectingcollectingPassed
future notification incarnationcollectingcollectingPassed
unknown event is inertcollectingcollectingPassed
empty delivery batchcollectingcollectingPassed
N stale deliveries before current deliverysealingsealingPassed
trace close-window then seal-successreadyreadyPassed
trace close-window then late-itemcollectingsealingFailed
trace seal-success then show-digestpublishingpublishingPassed
trace show-digest then paint-successpublishedpublishedPassed
trace show-digest then paint-failurepublish-errorpublish-errorPassed
trace paint-success then expand-digestexpandedexpandedPassed
trace paint-failure then retry-showpublishingpublishingPassed
trace retry-show then paint-successpublishedpublishedPassed
trace retry-show then paint-failurepublish-errorpublish-errorPassed
trace expand-digest then collapse-digestpublishedpublishedPassed
trace collapse-digest then expand-digestexpandedexpandedPassed
trace late-item then seal-successcollectingreadyFailed
trace late-item then late-itemcollectingsealingFailed
domain state regression 1: members{'phase': 'sealing', 'value': ['a', 'b']}{'phase': 'sealing', 'value': ['a', 'b']}Passed
domain state regression 2: shown{'phase': 'empty', 'value': []}{'phase': 'empty', 'value': []}Passed
domain state regression 3: sealed{'phase': 'ready', 'value': ['a', 'b']}{'phase': 'ready', 'value': ['a', 'b']}Passed
domain state regression 4: members{'phase': 'collecting', 'value': ['a', 'b']}{'phase': 'sealing', 'value': ['a', 'b']}Failed
domain state regression 5: next_window{'phase': 'collecting', 'value': ['c']}{'phase': 'sealing', 'value': ['c']}Failed
domain state regression 6: shown{'phase': 'published', 'value': ['a']}{'phase': 'published', 'value': ['a']}Passed
domain state regression 7: shown{'phase': 'collecting', 'value': []}{'phase': 'published', 'value': ['a', 'b']}Failed

SHA-256 / b4ee58690739797bc5c41f2f7050dd14775cae0b2e8692c289db68adf144590a

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 = {('collecting', 'close-window'): 'sealing', ('sealing', 'seal-success'): 'ready', ('ready', 'show-digest'): 'publishing', ('publishing', 'paint-success'): 'published', ('publishing', 'paint-failure'): 'publish-error', ('publish-error', 'retry-show'): 'publishing', ('published', 'expand-digest'): 'expanded', ('expanded', 'collapse-digest'): 'published', ('sealing', 'late-item'): 'published', ('collecting', 'close-empty-window'): 'empty'}
    data = json.loads(json.dumps({'members': ['a', 'b'], 'sealed': [], 'next_window': [], 'shown': []})) if payload is None else {**json.loads(json.dumps({'members': ['a', 'b'], 'sealed': [], 'next_window': [], 'shown': []})), **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 == 'close-empty-window' and data['members']: event = 'close-window'
            if event == 'late-item': data['next_window'].append(arg.get('item','late'))
            if event == 'seal-success': data['sealed'] = data['members'][:]
            state = table.get((state, event), state)
            if state == 'published': data['shown'] = data['sealed'][:]
            if state == 'empty': data['shown'] = []
    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('collecting / close-window', solve('collecting', [('close-window', N)], N), 'sealing')
check('sealing / seal-success', solve('sealing', [('seal-success', N)], N), 'ready')
check('ready / show-digest', solve('ready', [('show-digest', N)], N), 'publishing')
check('publishing / paint-success', solve('publishing', [('paint-success', N)], N), 'published')
check('publishing / paint-failure', solve('publishing', [('paint-failure', N)], N), 'publish-error')
check('publish-error / retry-show', solve('publish-error', [('retry-show', N)], N), 'publishing')
check('published / expand-digest', solve('published', [('expand-digest', N)], N), 'expanded')
check('expanded / collapse-digest', solve('expanded', [('collapse-digest', N)], N), 'published')
check('sealing / late-item', solve('sealing', [('late-item', N)], N), 'sealing')
check('collecting / close-empty-window', solve('collecting', [('close-empty-window', N)], N, {'members': []}), 'empty')
check('older notification incarnation', solve('collecting', [('close-window', N - 1)], N), 'collecting')
check('future notification incarnation', solve('collecting', [('close-window', N + 1)], N), 'collecting')
check('unknown event is inert', solve('collecting', [('unknown-event', N)], N), 'collecting')
check('empty delivery batch', solve('collecting', [], N), 'collecting')
check('N stale deliveries before current delivery', solve('collecting', [('close-window', N - 1)] * N + [('close-window', N)], N), 'sealing')
check('trace close-window then seal-success', solve('collecting', [('close-window', N), ('seal-success', N)], N), 'ready')
check('trace close-window then late-item', solve('collecting', [('close-window', N), ('late-item', N)], N), 'sealing')
check('trace seal-success then show-digest', solve('sealing', [('seal-success', N), ('show-digest', N)], N), 'publishing')
check('trace show-digest then paint-success', solve('ready', [('show-digest', N), ('paint-success', N)], N), 'published')
check('trace show-digest then paint-failure', solve('ready', [('show-digest', N), ('paint-failure', N)], N), 'publish-error')
check('trace paint-success then expand-digest', solve('publishing', [('paint-success', N), ('expand-digest', N)], N), 'expanded')
check('trace paint-failure then retry-show', solve('publishing', [('paint-failure', N), ('retry-show', N)], N), 'publishing')
check('trace retry-show then paint-success', solve('publish-error', [('retry-show', N), ('paint-success', N)], N), 'published')
check('trace retry-show then paint-failure', solve('publish-error', [('retry-show', N), ('paint-failure', N)], N), 'publish-error')
check('trace expand-digest then collapse-digest', solve('published', [('expand-digest', N), ('collapse-digest', N)], N), 'published')
check('trace collapse-digest then expand-digest', solve('expanded', [('collapse-digest', N), ('expand-digest', N)], N), 'expanded')
check('trace late-item then seal-success', solve('sealing', [('late-item', N), ('seal-success', N)], N), 'ready')
check('trace late-item then late-item', solve('sealing', [('late-item', N), ('late-item', N)], N), 'sealing')
check('domain state regression 1: members', solve('collecting', [('close-empty-window', N, {})], N, {}, 'members'), {'phase': 'sealing', 'value': ['a', 'b']})
check('domain state regression 2: shown', solve('collecting', [('close-empty-window', N, {})], N, {'members': []}, 'shown'), {'phase': 'empty', 'value': []})
check('domain state regression 3: sealed', solve('sealing', [('seal-success', N, {})], N, {}, 'sealed'), {'phase': 'ready', 'value': ['a', 'b']})
check('domain state regression 4: members', solve('sealing', [('late-item', N, {'item': 'c'})], N, {}, 'members'), {'phase': 'sealing', 'value': ['a', 'b']})
check('domain state regression 5: next_window', solve('sealing', [('late-item', N, {'item': 'c'})], N, {}, 'next_window'), {'phase': 'sealing', 'value': ['c']})
check('domain state regression 6: shown', solve('publishing', [('paint-success', N, {})], N, {'sealed': ['a']}, 'shown'), {'phase': 'published', 'value': ['a']})
check('domain state regression 7: shown', solve('collecting', [('close-window', N, {}), ('late-item', N, {'item': 'c'}), ('seal-success', N, {}), ('show-digest', N, {}), ('paint-success', N, {})], N, {}, 'shown'), {'phase': 'published', 'value': ['a', 'b']})
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
collecting / close-windowsealingsealingPassed
sealing / seal-successreadyreadyPassed
ready / show-digestpublishingpublishingPassed
publishing / paint-successpublishedpublishedPassed
publishing / paint-failurepublish-errorpublish-errorPassed
publish-error / retry-showpublishingpublishingPassed
published / expand-digestexpandedexpandedPassed
expanded / collapse-digestpublishedpublishedPassed
sealing / late-itempublishedsealingFailed
collecting / close-empty-windowemptyemptyPassed
older notification incarnationcollectingcollectingPassed
future notification incarnationcollectingcollectingPassed
unknown event is inertcollectingcollectingPassed
empty delivery batchcollectingcollectingPassed
N stale deliveries before current deliverysealingsealingPassed
trace close-window then seal-successreadyreadyPassed
trace close-window then late-itempublishedsealingFailed
trace seal-success then show-digestpublishingpublishingPassed
trace show-digest then paint-successpublishedpublishedPassed
trace show-digest then paint-failurepublish-errorpublish-errorPassed
trace paint-success then expand-digestexpandedexpandedPassed
trace paint-failure then retry-showpublishingpublishingPassed
trace retry-show then paint-successpublishedpublishedPassed
trace retry-show then paint-failurepublish-errorpublish-errorPassed
trace expand-digest then collapse-digestpublishedpublishedPassed
trace collapse-digest then expand-digestexpandedexpandedPassed
trace late-item then seal-successpublishedreadyFailed
trace late-item then late-itempublishedsealingFailed
domain state regression 1: members{'phase': 'sealing', 'value': ['a', 'b']}{'phase': 'sealing', 'value': ['a', 'b']}Passed
domain state regression 2: shown{'phase': 'empty', 'value': []}{'phase': 'empty', 'value': []}Passed
domain state regression 3: sealed{'phase': 'ready', 'value': ['a', 'b']}{'phase': 'ready', 'value': ['a', 'b']}Passed
domain state regression 4: members{'phase': 'published', 'value': ['a', 'b']}{'phase': 'sealing', 'value': ['a', 'b']}Failed
domain state regression 5: next_window{'phase': 'published', 'value': ['c']}{'phase': 'sealing', 'value': ['c']}Failed
domain state regression 6: shown{'phase': 'published', 'value': ['a']}{'phase': 'published', 'value': ['a']}Passed
domain state regression 7: shown{'phase': 'published', 'value': ['a', 'b']}{'phase': 'published', 'value': ['a', 'b']}Passed

SHA-256 / 4308f1d461f75a1a6990adfe75d51b57cf1ae113c1f84b426eb0ea29ff7dc4b5

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The verified repair and its recorded checks are member-only.

This mechanism has 35 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 2026-09-29T14:42:30.906184+00:00.

Case digest / 729feddef2811af9d1a52bf42e4365054f45e59cae67e98d5b8065779d0dd08c