same error for me: anything i paste gets pasted into the .ipynb. and if i copy a jupyter cell, that doesn’t get overwritten by copying something else.
the only workaround is to not have the .ipynb file tab active, then you can paste into the chat/agent.
OS X 14.2 (23C64)
Version: 1.0.1
VSCode Version: 1.96.2
Commit: 5491d1158b9f2bf4c483cff438c7cc162fd7d130
Date: 2025-06-08T00:25:32.625Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 23.2.0