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When hit max_output_tokens, some events are not emitted and logged #4733
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area:sessionsSession management, resume, history, session picker, and session stateSession management, resume, history, session picker, and session state
Description
Describe the bug
When the AI's output is truncated because it exceeds max_output_tokens and a subsequent request is made, both the current response and the next "continue" request are lost.
This happens in BYOK usage. I use the custom provider and it provides 65536 max_output_tokens. So it easily triggered this bug.
See this events.jsonl below (input and output is ommited for privacy):
Affected version
v1.0.83
Steps to reproduce the behavior
No response
Expected behavior
No response
Additional context
{"type":"session.start","data":{"sessionId":"summary-qq-group-957302634-1788584545","version":1,"producer":"copilot-agent","copilotVersion":"0.0.0","startTime":"2026-09-05T05:02:26.005Z","selectedModel":"deepseek-v4-flash","reasoningEffort":"high","contextTier":null,"context":{"cwd":"/home/cola/Softwares/kanade-bot"},"remoteSteerable":false,"alreadyInUse":false},"id":"3e23bf11-4b01-4b8a-bc43-ad9b7d007c69","timestamp":"2026-09-05T05:02:26.024Z","parentId":null}
{"type":"user.message","data":{"content":"...","transformedContent":"...","messageId":"33fe414d-6631-449a-a351-3a34b2c2b68d","supportedNativeDocumentMimeTypes":[],"delivery":"idle","interactionId":"9596a41f-2bfc-4191-998c-740b2e30caec","turnId":"0","parentAgentTaskId":"65b27352-d09e-4c72-956b-b69594366d8c"},"id":"f56f57fc-8c67-4bd2-a372-cfb61f2c4109","timestamp":"2026-09-05T05:02:29.423Z","parentId":"3e23bf11-4b01-4b8a-bc43-ad9b7d007c69"}
{"type":"system.message","data":{"role":"system","content":"...","interactionId":"9596a41f-2bfc-4191-998c-740b2e30caec"},"id":"a33407ed-4a7b-4feb-ad75-83d6b0eac50b","timestamp":"2026-09-05T05:02:29.445Z","parentId":"f56f57fc-8c67-4bd2-a372-cfb61f2c4109"}
{"type":"assistant.turn_start","data":{"turnId":"0","interactionId":"9596a41f-2bfc-4191-998c-740b2e30caec"},"id":"5583fe72-b633-44ea-a183-7ac781d075d2","timestamp":"2026-09-05T05:02:29.458Z","parentId":"a33407ed-4a7b-4feb-ad75-83d6b0eac50b"}
{"type":"assistant.turn_end","data":{"turnId":"0"},"id":"5df48ed1-fe69-4ffe-8645-f0fa2545ef14","timestamp":"2026-09-05T05:03:40.349Z","parentId":"5583fe72-b633-44ea-a183-7ac781d075d2"}
{"type":"assistant.turn_start","data":{"turnId":"1","interactionId":"9596a41f-2bfc-4191-998c-740b2e30caec"},"id":"53c4e5ae-2365-4391-86b3-c39735958279","timestamp":"2026-09-05T05:03:40.349Z","parentId":"5df48ed1-fe69-4ffe-8645-f0fa2545ef14"}
{"type":"assistant.turn_end","data":{"turnId":"1"},"id":"d48f14f2-263b-4990-8d66-f5e858a49b10","timestamp":"2026-09-05T05:04:51.913Z","parentId":"53c4e5ae-2365-4391-86b3-c39735958279"}
{"type":"assistant.turn_start","data":{"turnId":"2","interactionId":"9596a41f-2bfc-4191-998c-740b2e30caec"},"id":"e77c5372-08d4-47ba-b886-5a75ae6a5a6d","timestamp":"2026-09-05T05:04:51.914Z","parentId":"d48f14f2-263b-4990-8d66-f5e858a49b10"}
{"type":"assistant.message","data":{"messageId":"51f06be7-30d8-4d28-b8ae-e8dc1fcc9937","model":"deepseek-v4-flash","content":"(继续)...","toolRequests":[],"interactionId":"9596a41f-2bfc-4191-998c-740b2e30caec","turnId":"2","reasoningText":"Let me continue writing the topic summary. I was in the middle of topic 12. Let me continue from there, then complete the personal image section.","rte":false,"apiCallId":"6197b23f-7420-44dd-8bc4-a032e5784de2"},"id":"7fd35caa-4f74-4365-84d5-c39f7556561a","timestamp":"2026-09-05T05:05:41.237Z","parentId":"e77c5372-08d4-47ba-b886-5a75ae6a5a6d"}
{"type":"assistant.turn_end","data":{"turnId":"2"},"id":"1d7b9c22-2a37-4a73-b54e-f7f398c00f40","timestamp":"2026-09-05T05:05:41.244Z","parentId":"7fd35caa-4f74-4365-84d5-c39f7556561a"}
{"type":"session.shutdown","data":{"shutdownType":"routine","totalPremiumRequests":0,"totalNanoAiu":0,"totalApiDurationMs":190704,"sessionStartTime":1788584546005,"eventsFileSizeBytes":368878,"codeChanges":{"linesAdded":0,"linesRemoved":0,"filesModified":[]},"modelMetrics":{"deepseek-v4-flash":{"requests":{"count":3,"cost":0},"usage":{"inputTokens":234114,"outputTokens":21467,"cacheReadTokens":147456,"cacheWriteTokens":0,"reasoningTokens":14945},"totalNanoAiu":0}},"agentMetrics":{"main":{"totalApiDurationMs":190704,"totalNanoAiu":0.0,"modelMetrics":{"deepseek-v4-flash":{"requests":{"count":3,"cost":0.0},"usage":{"inputTokens":234114,"outputTokens":21467,"cacheReadTokens":147456,"cacheWriteTokens":0,"reasoningTokens":14945},"totalNanoAiu":0.0}}}},"currentModel":"deepseek-v4-flash","currentTokens":81090,"systemTokens":816,"conversationTokens":68907,"toolDefinitionsTokens":11364},"id":"391655ed-981c-4225-b84c-8948504c7bae","timestamp":"2026-09-05T05:05:41.537Z","parentId":"1d7b9c22-2a37-4a73-b54e-f7f398c00f40"}OS: Linux Mint 22.3
Copilot SDK Version: v1.0.13
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