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Version 26.4.0 sometimes doesn't recognize Notebooks #25999
Description
Type: Bug
Behaviour
I have a virtual conda environment and opened a Jupyter Notebook.
I noticed that imports don't seem to extend to cells below the cell containing the import. Restarting VS Code did not fix the issue but downgrading to 26.2.0 did fix it.
Steps to reproduce:
- Have a Notebook with the following content:
Cell 1:
import pandas as pdCell 2:
df = pd.read_csv('some file.csv')- Observe that
pdin the second cell stays white and the import in cell 1 is darkened out.
Diagnostic data
Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)
XXX
Extension version: 2026.4.0
VS Code version: Code 1.123.0 (6a44c352bd24569c417e530095901b649960f9f8, 2026-06-03T11:29:03+02:00)
OS version: Darwin arm64 25.5.0
Modes:
Remote OS version: Linux x64 5.15.0-119-generic
- Python version (& distribution if applicable, e.g. Anaconda): 3.12.13
- Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Conda
- Value of the
python.languageServersetting: Pylance
User Settings
languageServer: "Pylance"
testing
• pytestArgs: "<placeholder>"
• pytestEnabled: true
Installed Extensions
| Extension Name | Extension Id | Version |
|---|---|---|
| bash-ide-vscode | mad | 1.43.0 |
| claude-code | Ant | 2.1.169 |
| cmake | twx | 0.0.17 |
| cmake-language-support-vscode | jos | 0.0.9 |
| cmake-tools | ms- | 1.23.52 |
| cpp-devtools | ms- | 0.5.13 |
| cpptools | ms- | 1.32.2 |
| datawrangler | ms- | 1.24.1 |
| debugpy | ms- | 2026.6.0 |
| docker | doc | 0.18.0 |
| gitlab-workflow | Git | 6.81.0 |
| gitlens | eam | 18.0.0 |
| hexeditor | ms- | 1.11.1 |
| html-preview-vscode | geo | 0.2.5 |
| js-debug | ms- | 1.117.0 |
| jsts-chat-features | Typ | 0.0.2 |
| jupyter | ms- | 2025.9.1 |
| jupyter-renderers | ms- | 1.3.0 |
| live-server | ms- | 0.4.19 |
| python | ms- | 2026.2.0 |
| snakemake-lang | sna | 0.8.2 |
| vscode-containers | ms- | 2.4.5 |
| vscode-docker | ms- | 2.0.0 |
| vscode-dotnet-runtime | ms- | 3.0.2 |
| vscode-edit-csv | jan | 0.11.9 |
| vscode-js-profile-table | ms- | 1.0.10 |
| vscode-jupyter-cell-tags | ms- | 0.1.9 |
| vscode-jupyter-slideshow | ms- | 0.1.6 |
| vscode-language-pack-de | MS- | 1.123.2026060618 |
| vscode-markdownlint | Dav | 0.61.2 |
| vscode-pull-request-github | Git | 0.146.0 |
| vscode-pylance | ms- | 2026.2.1 |
| vscode-xml | red | 0.29.3 |
| vscode-yaml | red | 1.23.0 |
| vsliveshare | ms- | 1.1.122 |
Activity
Thomas1664 commentedon Jun 9, 2026
I can't reproduce the issue reliably but it does happen sometimes to me.
eleanorjboyd commentedon Jul 2, 2026
Are you still facing this issue?
Thomas1664 commentedon Jul 29, 2026
Yes, but the symptoms slightly changed: Now the language server doesn't seem to pick up when opening a notebook, i.e. no syntax highlighting for the notebook. The notebook was checked into source control but "dirty". I looked at the logs but I couldn't find anything unusual. However, the issue remains very hard to reproduce and is therefore also hard to pin down to a specific version.
[-]Version 26.4.0 is broken[/-][+]Version 26.4.0 sometimes doesn't recognize Notebooks[/+]github-actions commentedon Aug 28, 2026
Hey Karthik Nadig (@karthiknadig), this issue might need further attention.
Thomas1664, you can help us out by closing this issue if the problem no longer exists, or adding more information.
github-actions commentedon Sep 28, 2026
Because we have not heard back with the information we requested, we are closing this issue for now. If you are able to provide the info later on, then we will be happy to re-open this issue to pick up where we left off.
Happy Coding!