When hit max_output_tokens, some events are not emitted and logged

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

Không có tệp triển khai, bài kiểm thử hoặc lệnh tái hiện nào được nêu. Hãy bắt đầu bằng cách truy vết việc phát sự kiện và ghi nhật ký xung quanh việc cắt ngắn max_output_tokens trong Copilot CLI, sau đó tái hiện kịch bản custom-provider được cung cấp và xác minh rằng cả phản hồi bị cắt ngắn lẫn yêu cầu tiếp tục đều được phát ra và ghi nhật ký.