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FA-33971 / Notification interfaces / Open access

Toast action request feedback: transport-unknown from submitting · case 01

The transport-unknown event leaves a notification in failed instead of uncertain.

Verified by executionVariant 1 · 41 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Unknown delivery is presented as definite rejection.

THE FAILURE

Unknown delivery is presented as definite rejection.

Unsuccessful approach: Rearming an uncertain command allows duplicate execution.

Case contract

Toast action request feedback is a bounded visual-notification workflow with mutable policy state {'command': 'c1', 'pending': [], 'completed': [], 'transport_known': True}. Its default transition relation is {('ready', 'action-click'): 'submitting', ('submitting', 'second-click'): 'submitting', ('submitting', 'accepted'): 'running', ('running', 'completion'): 'succeeded', ('running', 'rejection'): 'failed', ('failed', 'retry-click'): 'submitting', ('submitting', 'transport-unknown'): 'uncertain', ('uncertain', 'status-confirmed-running'): 'running', ('uncertain', 'status-confirmed-absent'): 'ready', ('succeeded', 'stale-rejection'): 'succeeded'}; 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 = {('ready', 'action-click'): 'submitting', ('submitting', 'second-click'): 'submitting', ('submitting', 'accepted'): 'running', ('running', 'completion'): 'succeeded', ('running', 'rejection'): 'failed', ('failed', 'retry-click'): 'submitting', ('submitting', 'transport-unknown'): 'failed', ('uncertain', 'status-confirmed-running'): 'running', ('uncertain', 'status-confirmed-absent'): 'ready', ('succeeded', 'stale-rejection'): 'succeeded'}
    data = json.loads(json.dumps({'command': 'c1', 'pending': [], 'completed': [], 'transport_known': True})) if payload is None else {**json.loads(json.dumps({'command': 'c1', 'pending': [], 'completed': [], 'transport_known': True})), **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
            command = arg.get('command', data['command'])
            if event in ('accepted', 'completion', 'rejection') and command != data['command']: event = 'unknown-event'
            if event in ('action-click','retry-click') and data['command'] not in data['pending']: data['pending'].append(data['command'])
            if event == 'transport-unknown': data['transport_known'] = False
            if event.startswith('status-confirmed-'): data['transport_known'] = True
            state = table.get((state, event), state)
            if state == 'succeeded':
                data['pending'] = [x for x in data['pending'] if x != data['command']]
                if data['command'] not in data['completed']: data['completed'].append(data['command'])
            if state == 'ready': data['pending'] = [x for x in data['pending'] if x != data['command']]
    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('ready / action-click', solve('ready', [('action-click', N)], N), 'submitting')
check('submitting / second-click', solve('submitting', [('second-click', N)], N), 'submitting')
check('submitting / accepted', solve('submitting', [('accepted', N)], N), 'running')
check('running / completion', solve('running', [('completion', N)], N), 'succeeded')
check('running / rejection', solve('running', [('rejection', N)], N), 'failed')
check('failed / retry-click', solve('failed', [('retry-click', N)], N), 'submitting')
check('submitting / transport-unknown', solve('submitting', [('transport-unknown', N)], N), 'uncertain')
check('uncertain / status-confirmed-running', solve('uncertain', [('status-confirmed-running', N)], N), 'running')
check('uncertain / status-confirmed-absent', solve('uncertain', [('status-confirmed-absent', N)], N), 'ready')
check('succeeded / stale-rejection', solve('succeeded', [('stale-rejection', N)], N), 'succeeded')
check('older notification incarnation', solve('ready', [('action-click', N - 1)], N), 'ready')
check('future notification incarnation', solve('ready', [('action-click', N + 1)], N), 'ready')
check('unknown event is inert', solve('ready', [('unknown-event', N)], N), 'ready')
check('empty delivery batch', solve('ready', [], N), 'ready')
check('N stale deliveries before current delivery', solve('ready', [('action-click', N - 1)] * N + [('action-click', N)], N), 'submitting')
check('trace action-click then second-click', solve('ready', [('action-click', N), ('second-click', N)], N), 'submitting')
check('trace action-click then accepted', solve('ready', [('action-click', N), ('accepted', N)], N), 'running')
check('trace action-click then transport-unknown', solve('ready', [('action-click', N), ('transport-unknown', N)], N), 'uncertain')
check('trace second-click then second-click', solve('submitting', [('second-click', N), ('second-click', N)], N), 'submitting')
check('trace second-click then accepted', solve('submitting', [('second-click', N), ('accepted', N)], N), 'running')
check('trace second-click then transport-unknown', solve('submitting', [('second-click', N), ('transport-unknown', N)], N), 'uncertain')
check('trace accepted then completion', solve('submitting', [('accepted', N), ('completion', N)], N), 'succeeded')
check('trace accepted then rejection', solve('submitting', [('accepted', N), ('rejection', N)], N), 'failed')
check('trace completion then stale-rejection', solve('running', [('completion', N), ('stale-rejection', N)], N), 'succeeded')
check('trace rejection then retry-click', solve('running', [('rejection', N), ('retry-click', N)], N), 'submitting')
check('trace retry-click then second-click', solve('failed', [('retry-click', N), ('second-click', N)], N), 'submitting')
check('trace retry-click then accepted', solve('failed', [('retry-click', N), ('accepted', N)], N), 'running')
check('trace retry-click then transport-unknown', solve('failed', [('retry-click', N), ('transport-unknown', N)], N), 'uncertain')
check('trace transport-unknown then status-confirmed-running', solve('submitting', [('transport-unknown', N), ('status-confirmed-running', N)], N), 'running')
check('trace transport-unknown then status-confirmed-absent', solve('submitting', [('transport-unknown', N), ('status-confirmed-absent', N)], N), 'ready')
check('trace status-confirmed-running then completion', solve('uncertain', [('status-confirmed-running', N), ('completion', N)], N), 'succeeded')
check('trace status-confirmed-running then rejection', solve('uncertain', [('status-confirmed-running', N), ('rejection', N)], N), 'failed')
check('trace status-confirmed-absent then action-click', solve('uncertain', [('status-confirmed-absent', N), ('action-click', N)], N), 'submitting')
check('trace stale-rejection then stale-rejection', solve('succeeded', [('stale-rejection', N), ('stale-rejection', N)], N), 'succeeded')
check('domain state regression 1: completed', solve('running', [('completion', N, {'command': 'old'})], N, {}, 'completed'), {'phase': 'running', 'value': []})
check('domain state regression 2: pending', solve('running', [('completion', N, {'command': 'c1'})], N, {'pending': ['c1']}, 'pending'), {'phase': 'succeeded', 'value': []})
check('domain state regression 3: completed', solve('running', [('completion', N, {})], N, {}, 'completed'), {'phase': 'succeeded', 'value': ['c1']})
check('domain state regression 4: transport_known', solve('submitting', [('transport-unknown', N, {})], N, {}, 'transport_known'), {'phase': 'uncertain', 'value': False})
check('domain state regression 5: transport_known', solve('uncertain', [('status-confirmed-running', N, {})], N, {'transport_known': False}, 'transport_known'), {'phase': 'running', 'value': True})
check('domain state regression 6: pending', solve('ready', [('action-click', N, {})], N, {'pending': ['other']}, 'pending'), {'phase': 'submitting', 'value': ['other', 'c1']})
check('domain state regression 7: completed', solve('ready', [('action-click', N, {}), ('accepted', N, {}), ('completion', N, {})], N, {}, 'completed'), {'phase': 'succeeded', 'value': ['c1']})
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
ready / action-clicksubmittingsubmittingPassed
submitting / second-clicksubmittingsubmittingPassed
submitting / acceptedrunningrunningPassed
running / completionsucceededsucceededPassed
running / rejectionfailedfailedPassed
failed / retry-clicksubmittingsubmittingPassed
submitting / transport-unknownfaileduncertainFailed
uncertain / status-confirmed-runningrunningrunningPassed
uncertain / status-confirmed-absentreadyreadyPassed
succeeded / stale-rejectionsucceededsucceededPassed
older notification incarnationreadyreadyPassed
future notification incarnationreadyreadyPassed
unknown event is inertreadyreadyPassed
empty delivery batchreadyreadyPassed
N stale deliveries before current deliverysubmittingsubmittingPassed
trace action-click then second-clicksubmittingsubmittingPassed
trace action-click then acceptedrunningrunningPassed
trace action-click then transport-unknownfaileduncertainFailed
trace second-click then second-clicksubmittingsubmittingPassed
trace second-click then acceptedrunningrunningPassed
trace second-click then transport-unknownfaileduncertainFailed
trace accepted then completionsucceededsucceededPassed
trace accepted then rejectionfailedfailedPassed
trace completion then stale-rejectionsucceededsucceededPassed
trace rejection then retry-clicksubmittingsubmittingPassed
trace retry-click then second-clicksubmittingsubmittingPassed
trace retry-click then acceptedrunningrunningPassed
trace retry-click then transport-unknownfaileduncertainFailed
trace transport-unknown then status-confirmed-runningfailedrunningFailed
trace transport-unknown then status-confirmed-absentfailedreadyFailed
trace status-confirmed-running then completionsucceededsucceededPassed
trace status-confirmed-running then rejectionfailedfailedPassed
trace status-confirmed-absent then action-clicksubmittingsubmittingPassed
trace stale-rejection then stale-rejectionsucceededsucceededPassed
domain state regression 1: completed{'phase': 'running', 'value': []}{'phase': 'running', 'value': []}Passed
domain state regression 2: pending{'phase': 'succeeded', 'value': []}{'phase': 'succeeded', 'value': []}Passed
domain state regression 3: completed{'phase': 'succeeded', 'value': ['c1']}{'phase': 'succeeded', 'value': ['c1']}Passed
domain state regression 4: transport_known{'phase': 'failed', 'value': False}{'phase': 'uncertain', 'value': False}Failed
domain state regression 5: transport_known{'phase': 'running', 'value': True}{'phase': 'running', 'value': True}Passed
domain state regression 6: pending{'phase': 'submitting', 'value': ['other', 'c1']}{'phase': 'submitting', 'value': ['other', 'c1']}Passed
domain state regression 7: completed{'phase': 'succeeded', 'value': ['c1']}{'phase': 'succeeded', 'value': ['c1']}Passed

SHA-256 / d6718e53f8b558ce691cef7e66a4eaea3618dc9df91f6a860e2654e6d70a49c8

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 = {('ready', 'action-click'): 'submitting', ('submitting', 'second-click'): 'submitting', ('submitting', 'accepted'): 'running', ('running', 'completion'): 'succeeded', ('running', 'rejection'): 'failed', ('failed', 'retry-click'): 'submitting', ('submitting', 'transport-unknown'): 'ready', ('uncertain', 'status-confirmed-running'): 'running', ('uncertain', 'status-confirmed-absent'): 'ready', ('succeeded', 'stale-rejection'): 'succeeded'}
    data = json.loads(json.dumps({'command': 'c1', 'pending': [], 'completed': [], 'transport_known': True})) if payload is None else {**json.loads(json.dumps({'command': 'c1', 'pending': [], 'completed': [], 'transport_known': True})), **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
            command = arg.get('command', data['command'])
            if event in ('accepted', 'completion', 'rejection') and command != data['command']: event = 'unknown-event'
            if event in ('action-click','retry-click') and data['command'] not in data['pending']: data['pending'].append(data['command'])
            if event == 'transport-unknown': data['transport_known'] = False
            if event.startswith('status-confirmed-'): data['transport_known'] = True
            state = table.get((state, event), state)
            if state == 'succeeded':
                data['pending'] = [x for x in data['pending'] if x != data['command']]
                if data['command'] not in data['completed']: data['completed'].append(data['command'])
            if state == 'ready': data['pending'] = [x for x in data['pending'] if x != data['command']]
    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('ready / action-click', solve('ready', [('action-click', N)], N), 'submitting')
check('submitting / second-click', solve('submitting', [('second-click', N)], N), 'submitting')
check('submitting / accepted', solve('submitting', [('accepted', N)], N), 'running')
check('running / completion', solve('running', [('completion', N)], N), 'succeeded')
check('running / rejection', solve('running', [('rejection', N)], N), 'failed')
check('failed / retry-click', solve('failed', [('retry-click', N)], N), 'submitting')
check('submitting / transport-unknown', solve('submitting', [('transport-unknown', N)], N), 'uncertain')
check('uncertain / status-confirmed-running', solve('uncertain', [('status-confirmed-running', N)], N), 'running')
check('uncertain / status-confirmed-absent', solve('uncertain', [('status-confirmed-absent', N)], N), 'ready')
check('succeeded / stale-rejection', solve('succeeded', [('stale-rejection', N)], N), 'succeeded')
check('older notification incarnation', solve('ready', [('action-click', N - 1)], N), 'ready')
check('future notification incarnation', solve('ready', [('action-click', N + 1)], N), 'ready')
check('unknown event is inert', solve('ready', [('unknown-event', N)], N), 'ready')
check('empty delivery batch', solve('ready', [], N), 'ready')
check('N stale deliveries before current delivery', solve('ready', [('action-click', N - 1)] * N + [('action-click', N)], N), 'submitting')
check('trace action-click then second-click', solve('ready', [('action-click', N), ('second-click', N)], N), 'submitting')
check('trace action-click then accepted', solve('ready', [('action-click', N), ('accepted', N)], N), 'running')
check('trace action-click then transport-unknown', solve('ready', [('action-click', N), ('transport-unknown', N)], N), 'uncertain')
check('trace second-click then second-click', solve('submitting', [('second-click', N), ('second-click', N)], N), 'submitting')
check('trace second-click then accepted', solve('submitting', [('second-click', N), ('accepted', N)], N), 'running')
check('trace second-click then transport-unknown', solve('submitting', [('second-click', N), ('transport-unknown', N)], N), 'uncertain')
check('trace accepted then completion', solve('submitting', [('accepted', N), ('completion', N)], N), 'succeeded')
check('trace accepted then rejection', solve('submitting', [('accepted', N), ('rejection', N)], N), 'failed')
check('trace completion then stale-rejection', solve('running', [('completion', N), ('stale-rejection', N)], N), 'succeeded')
check('trace rejection then retry-click', solve('running', [('rejection', N), ('retry-click', N)], N), 'submitting')
check('trace retry-click then second-click', solve('failed', [('retry-click', N), ('second-click', N)], N), 'submitting')
check('trace retry-click then accepted', solve('failed', [('retry-click', N), ('accepted', N)], N), 'running')
check('trace retry-click then transport-unknown', solve('failed', [('retry-click', N), ('transport-unknown', N)], N), 'uncertain')
check('trace transport-unknown then status-confirmed-running', solve('submitting', [('transport-unknown', N), ('status-confirmed-running', N)], N), 'running')
check('trace transport-unknown then status-confirmed-absent', solve('submitting', [('transport-unknown', N), ('status-confirmed-absent', N)], N), 'ready')
check('trace status-confirmed-running then completion', solve('uncertain', [('status-confirmed-running', N), ('completion', N)], N), 'succeeded')
check('trace status-confirmed-running then rejection', solve('uncertain', [('status-confirmed-running', N), ('rejection', N)], N), 'failed')
check('trace status-confirmed-absent then action-click', solve('uncertain', [('status-confirmed-absent', N), ('action-click', N)], N), 'submitting')
check('trace stale-rejection then stale-rejection', solve('succeeded', [('stale-rejection', N), ('stale-rejection', N)], N), 'succeeded')
check('domain state regression 1: completed', solve('running', [('completion', N, {'command': 'old'})], N, {}, 'completed'), {'phase': 'running', 'value': []})
check('domain state regression 2: pending', solve('running', [('completion', N, {'command': 'c1'})], N, {'pending': ['c1']}, 'pending'), {'phase': 'succeeded', 'value': []})
check('domain state regression 3: completed', solve('running', [('completion', N, {})], N, {}, 'completed'), {'phase': 'succeeded', 'value': ['c1']})
check('domain state regression 4: transport_known', solve('submitting', [('transport-unknown', N, {})], N, {}, 'transport_known'), {'phase': 'uncertain', 'value': False})
check('domain state regression 5: transport_known', solve('uncertain', [('status-confirmed-running', N, {})], N, {'transport_known': False}, 'transport_known'), {'phase': 'running', 'value': True})
check('domain state regression 6: pending', solve('ready', [('action-click', N, {})], N, {'pending': ['other']}, 'pending'), {'phase': 'submitting', 'value': ['other', 'c1']})
check('domain state regression 7: completed', solve('ready', [('action-click', N, {}), ('accepted', N, {}), ('completion', N, {})], N, {}, 'completed'), {'phase': 'succeeded', 'value': ['c1']})
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
ready / action-clicksubmittingsubmittingPassed
submitting / second-clicksubmittingsubmittingPassed
submitting / acceptedrunningrunningPassed
running / completionsucceededsucceededPassed
running / rejectionfailedfailedPassed
failed / retry-clicksubmittingsubmittingPassed
submitting / transport-unknownreadyuncertainFailed
uncertain / status-confirmed-runningrunningrunningPassed
uncertain / status-confirmed-absentreadyreadyPassed
succeeded / stale-rejectionsucceededsucceededPassed
older notification incarnationreadyreadyPassed
future notification incarnationreadyreadyPassed
unknown event is inertreadyreadyPassed
empty delivery batchreadyreadyPassed
N stale deliveries before current deliverysubmittingsubmittingPassed
trace action-click then second-clicksubmittingsubmittingPassed
trace action-click then acceptedrunningrunningPassed
trace action-click then transport-unknownreadyuncertainFailed
trace second-click then second-clicksubmittingsubmittingPassed
trace second-click then acceptedrunningrunningPassed
trace second-click then transport-unknownreadyuncertainFailed
trace accepted then completionsucceededsucceededPassed
trace accepted then rejectionfailedfailedPassed
trace completion then stale-rejectionsucceededsucceededPassed
trace rejection then retry-clicksubmittingsubmittingPassed
trace retry-click then second-clicksubmittingsubmittingPassed
trace retry-click then acceptedrunningrunningPassed
trace retry-click then transport-unknownreadyuncertainFailed
trace transport-unknown then status-confirmed-runningreadyrunningFailed
trace transport-unknown then status-confirmed-absentreadyreadyPassed
trace status-confirmed-running then completionsucceededsucceededPassed
trace status-confirmed-running then rejectionfailedfailedPassed
trace status-confirmed-absent then action-clicksubmittingsubmittingPassed
trace stale-rejection then stale-rejectionsucceededsucceededPassed
domain state regression 1: completed{'phase': 'running', 'value': []}{'phase': 'running', 'value': []}Passed
domain state regression 2: pending{'phase': 'succeeded', 'value': []}{'phase': 'succeeded', 'value': []}Passed
domain state regression 3: completed{'phase': 'succeeded', 'value': ['c1']}{'phase': 'succeeded', 'value': ['c1']}Passed
domain state regression 4: transport_known{'phase': 'ready', 'value': False}{'phase': 'uncertain', 'value': False}Failed
domain state regression 5: transport_known{'phase': 'running', 'value': True}{'phase': 'running', 'value': True}Passed
domain state regression 6: pending{'phase': 'submitting', 'value': ['other', 'c1']}{'phase': 'submitting', 'value': ['other', 'c1']}Passed
domain state regression 7: completed{'phase': 'succeeded', 'value': ['c1']}{'phase': 'succeeded', 'value': ['c1']}Passed

SHA-256 / 1dc206d6cdedb8ea2c403e65e2c7483b4a72210079c0258f3ceea5f78840a0be

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 41 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.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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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 2026-09-29T14:42:27.532508+00:00.

Case digest / a158d59d609147be0bf6bb8f067d811001cb8206f154e1fdfe7326b9ff0285ad