Force-submitted streering message's response is not rendered

[ulugbekna]

agent-debug-log-a2e084fc-8c8d-47c8-adb1-146508cf54ba.json (private agent host debug logs)

Description

repro:

1. ask agent "tell me a long story" (I reproed with opus 4.8 max 1m)
2. try sending a steering message "Continue in French" -- but the steering message will be just pending, so I just force submitted it
3. chat hang with message "Analyzing..." and just terminated
4. looking at the logs, I see that there was actually response from the model in french

Issue Details

Item	Value
Issue Category	Bug
Target	Agents Window
VS Code Version	Code - Insiders 1.130.0-insider (Universal) (d443452, 2026-07-20T10:48:38-07:00)
OS Version	Darwin arm64 25.5.0

System Info

Item	Value
VS Code Version	Code - Insiders 1.130.0-insider (Universal) (d443452, 2026-07-20T10:48:38-07:00)
OS Version	Darwin arm64 25.5.0
CPUs	Apple M4 Pro (14 x 2400)
GPU Status	2d_canvas: enabled GPU0: VENDOR= 0x106b [Google Inc. (Apple)], DEVICE=0x0000 [ANGLE (Apple, ANGLE Metal Renderer: Apple M4 Pro, Version 26.5.2 (Build 25F84))], DRIVER_VENDOR=Apple, DRIVER_VERSION=26.5.2 ACTIVE Machine model name: Mac Machine model version: 16.8 direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: enabled_on trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgpu: enabled webnn: disabled_off
Load (avg)	4, 5, 7
Memory (System)	48.00GB (0.46GB free)
Process Argv	--log info --log github.copilot-chat=trace --log github.vscode-pull-request-github=debug --crash-reporter-id 8c80ab9c-ee3f-4087-8f5f-a4efe42eaf63
Screen Reader	no
VM	0%
User Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Code-Insiders/1.130.0-insider Chrome/148.0.7778.280 Electron/42.6.0 Safari/537.36
Installation pure	true

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Attachments

[ulugbekna]

Reopening the session, I actually do see the response -- I guess it's only broken when streaming