Notebook cell content landed in chat

[mmattb]

Type: Bug

Sonnet 4.6 was attempting to edit a notebook, adding some additional cells in the middle. The contents ended up in the chat instead of as notebook edits.

Extension version: 0.40.1
VS Code version: Code 1.112.0 (07ff9d6, 2026-03-17T18:09:23Z)
OS version: Linux x64 6.11.0-29-generic
Modes:

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i9-13980HX (32 x 2055)
GPU Status	2d_canvas: enabled GPU0: VENDOR= 0x10de, DEVICE=0x2820, DRIVER_VENDOR=Mesa, DRIVER_VERSION=25.2.8 GPU1: VENDOR= 0x8086, DEVICE=0xa788, DRIVER_VENDOR=Mesa, DRIVER_VERSION=25.2.8 ACTIVE Machine model name: Machine model version: 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: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off
Load (avg)	3, 2, 2
Memory (System)	15.24GB (3.03GB free)
Process Argv	--crash-reporter-id 31944a4a-b5d4-4a8d-a219-bc78742af4df
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	ubuntu:GNOME
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

[mmattb]

[mmattb]

+1; will stop marking repro after this. Just noting it's not a one-off

[DonJayamanne]

Thank you for filing this issue and sorry you are running into this.
Please can you try to replicate this issue and the the copilot chat logs see here https://github.com/microsoft/vscode/wiki/Copilot-Issues#language-model-requests-and-responses

🚨 Note: This log may contain personal information such as the contents of your files or terminal output. Please review the contents carefully before sharing it with anyone else.

Please can you share the screenshot, the images are not attached

[mmattb]

Sure; thanks @DonJayamanne . I have a .tar now with one of the requests that had bad behavior. I don't want to attach to a public bug since this codebase involves some ongoing research. Do you have an email address or secure box where I can drop it to you directly?

[mmattb]

(or alternatively if you give me some grep regexes to run on the files I can do that and post them here)