Copy/paste doesn't work properly in Jupyter notebooks

[bkuwahara]

Type: Bug

1. Open a new jupyter notebook file in VSCode.
2. Attempt to copy text in a cell. It should be possible to paste the text within the same cell.
3. Attemping to paste into a different cell will result in nothing happening.

VS Code version: Code 1.101.0 (Universal) (dfaf441, 2025-06-11T15:00:50.123Z)
OS version: Darwin arm64 24.5.0
Modes:

System Info

Item	Value
CPUs	Apple M3 Pro (12 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on 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 video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	2, 2, 3
Memory (System)	18.00GB (0.08GB free)
Process Argv	--crash-reporter-id e4d41de1-2995-4a89-b276-0f1a90e6008a --crash-reporter-id e4d41de1-2995-4a89-b276-0f1a90e6008a
Screen Reader	no
VM	0%

Extensions (29)

Extension	Author (truncated)	Version
docker	doc	0.10.0
copilot	Git	1.335.0
copilot-chat	Git	0.28.0
vscode-latex	mat	1.3.0
vscode-containers	ms-	2.0.3
vscode-docker	ms-	2.0.0
debugpy	ms-	2025.8.0
python	ms-	2025.8.0
vscode-pylance	ms-	2025.6.1
jupyter	ms-	2025.5.0
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.1.0
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
remote-containers	ms-	0.417.0
cmake-tools	ms-	1.20.53
cpptools	ms-	1.25.3
cpptools-extension-pack	ms-	1.3.1
makefile-tools	ms-	0.12.17
java	red	1.42.0
cmake	twx	0.0.17
intellicode-api-usage-examples	Vis	0.2.9
vscodeintellicode	Vis	1.3.2
vscode-gradle	vsc	3.16.4
vscode-java-debug	vsc	0.58.2
vscode-java-dependency	vsc	0.24.1
vscode-java-pack	vsc	0.29.2
vscode-java-test	vsc	0.43.1
vscode-maven	vsc	0.44.0

(1 theme extensions excluded)

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