Viewing a Jupyter Notebook deletes notebook metadata when using a remote Jupyter Server kernel

[micahyoung]

Type: Bug

1. Start a Jupyter Server from the command line (ex: jupyter notebook --NotebookApp.token='FooBar123')
2. Create Notebook (ex: Create: New Jupyter Notebook)
3. Run the notebook with the CLI Jupyter Server (ex: Click Run All, pick Existing Jupyter Server..., Enter http://localhost:8888?token=FooBar123)
4. Save the Notebook to disk
5. Add the notebook to git to see future changes
6. Close the notebook
7. Reopen the notebook
8. Bug: See there are unsaved changes in the just-opened notebook tab (Circle in top-right)
9. Save the unexpected changes (Cmd + S)
10. Bug: See metadata is deleted like below

    diff --git a/Untitled-1.ipynb b/Untitled-1.ipynb
    index ae73e8d..ca3bb30 100644
    --- a/Untitled-1.ipynb
    +++ b/Untitled-1.ipynb
    @@ -13,18 +13,6 @@
    "display_name": "Python 3 (ipykernel)",
    "language": "python",
    "name": "python3"
    -  },
    -  "language_info": {
    -   "codemirror_mode": {
    -    "name": "ipython",
    -    "version": 3
    -   },
    -   "file_extension": ".py",
    -   "mimetype": "text/x-python",
    -   "name": "python",
    -   "nbconvert_exporter": "python",
    -   "pygments_lexer": "ipython3",
    -   "version": "3.10.13"
    }
    },
    "nbformat": 4,

VS Code version: Code - Insiders 1.95.0-insider (Universal) (8965e51174c237ba2a7c4f7be991ffa0526892cb, 2024-10-16T05:04:09.933Z) OS version: Darwin arm64 23.6.0 Modes:

System Info

|Item|Value| |---|---| |CPUs|Apple M1 Max (10 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: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off| |Load (avg)|5, 5, 5| |Memory (System)|64.00GB (1.60GB free)| |Process Argv|--crash-reporter-id 9e8154df-c5d9-4b9a-bdee-61c35a37ba74| |Screen Reader|no| |VM|0%|

Extensions (11)

Extension|Author (truncated)|Version ---|---|--- copilot|Git|1.239.0 copilot-chat|Git|0.16.1 debugpy|ms-|2024.12.0 python|ms-|2024.17.2024101501 vscode-pylance|ms-|2024.10.1 jupyter|ms-|2024.10.2024101501 jupyter-keymap|ms-|1.1.2 jupyter-renderers|ms-|1.0.19 vscode-jupyter-cell-tags|ms-|0.1.9 vscode-jupyter-slideshow|ms-|0.1.6

A/B Experiments

``` vsliv368cf:30146710 vspor879:30202332 vspor708:30202333 vspor363:30204092 vscod805cf:30301675 vsaa593:30376534 py29gd2263:31024238 c4g48928:30535728 2i9eh265:30646982 962ge761:30841072 pythongtdpath:30726887 pythonnoceb:30776497 asynctok:30898717 dsvsc014:30777825 dsvsc015:30821418 pythonmypyd1:30859725 h48ei257:31000450 pythontbext0:30879054 accentitlementst:30870582 cppperfnew:30980852 pythonait:30973460 da93g388:31013173 dvdeprecation:31040973 dwnewjupyter:31046869 nb_pkg_only:31057982 nativerepl1:31134653 refactort:31084545 pythonrstrctxt:31093868 wkspc-onlycs-t:31132770 nativeloc1:31118317 wkspc-ranged-t:31151552 cf971741:31144450 e80f6927:31120813 defaultse:31146405 i21gd607:31141543 iacca1:31150324 notype1:31143044 showchatpanel:31139797 f8igb616:31140137 dwcopilot:31158714 g7688163:31155431 iconenabled:31158249 ```

[DonJayamanne]

Thank you for filing this issue, I can replicate this at my end.