Issue 17423 runtime reproduction
Commit: b5a226e49c52ecab4ddc2d678a7012d97e651a6a
Environment: Linux fs-32; Chromium collaborative preview; real web dev app 1280x800; Claude Sonnet 5.5
Sequence: two completed turns; manual /compact; one completed turn; Edit from here on second prompt / Revert and keep changes; three new sends.
Observed: revert succeeds; every send fails with No message found with message.uuid of: 64f303a9-6ac6-4c2f-8ae4-cb4ce86dbcf3
Transcript metadata (message bodies excluded):
{"line": 22, "type": "assistant", "subtype": null, "uuid": "64f303a9-6ac6-4c2f-8ae4-cb4ce86dbcf3"}
{"line": 33, "type": "assistant", "subtype": null, "uuid": "24967871-e53a-4d7b-af11-f2bb81633a45"}
{"line": 39, "type": "system", "subtype": "compact_boundary", "uuid": "4a6da669-8ef4-4eb3-956f-75ec06d98c9a", "compactMetadata": {"trigger": "manual", "preTokens": 83997, "durationMs": 10907, "preservedSegment": {"headUuid": "24967871-e53a-4d7b-af11-f2bb81633a45", "anchorUuid": "e21c0706-3dcf-41ee-bc47-0a3e382cb434", "tailUuid": "24967871-e53a-4d7b-af11-f2bb81633a45"}, "preservedMessages": {"anchorUuid": "e21c0706-3dcf-41ee-bc47-0a3e382cb434", "uuids": ["24967871-e53a-4d7b-af11-f2bb81633a45"], "allUuids": ["24967871-e53a-4d7b-af11-f2bb81633a45"]}, "postTokens": 1595, "cumulativeDroppedTokens": 82402}}
{"line": 63, "type": "assistant", "subtype": null, "uuid": "3d783edf-210f-48ca-95eb-7888be4f5f5c"}