Bash cell output visible only after execution and not during

[yeskarthik]

Environment data

• VS Code version: 1.105.0
• Jupyter Extension version (available under the Extensions sidebar): 2025.9.1
• Python Extension version (available under the Extensions sidebar): 2025.16.0
• OS (Windows | Mac | Linux distro) and version: Windows and Linux (Azure Linux)
• Python and/or Anaconda version: 3.12.12
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Jupyter server running: Local

Expected behaviour

Output must be visible during execution, this was working until a few days ago (possible until last update).

Actual behaviour

However, output is visible only after execution.

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

1. Repro gif

Logs

17:58:46.999 [info] Starting Kernel (Python Path: /usr/local/python/bin/python, Unknown, 3.12.12) for '/cookbook/sample.ipynb' (disableUI=false)
17:58:47.077 [warn] Failed to get activated env vars for /usr/local/python/bin/python in 56ms
17:58:47.098 [info] Process Execution: /usr/local/python/bin/python -m pip list
17:58:47.115 [warn] Failed to get activated env vars for /usr/local/python/bin/python in 71ms
17:58:47.134 [info] Process Execution: /usr/local/python/bin/python -c "import ipykernel; print(ipykernel.version); print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d"); print(ipykernel.file)"
17:58:47.150 [info] Process Execution: /usr/local/python/bin/python -m ipykernel_launcher --f=/.local/share/jupyter/runtime/kernel-v3a90d458b41ab68dd6e4796face026a1bb0881aac.json
> cwd: ~/cookbook
17:58:50.930 [info] Kernel successfully started
17:58:51.765 [error] Widget Error: Failed to access CDN https://unpkg.com/ after 0 attempt(s), TypeError: Failed to fetch
17:59:01.674 [info] Restart requested /cookbook/sample.ipynb
17:59:01.757 [warn] Failed to get activated env vars for /usr/local/python/bin/python in 52ms
17:59:01.779 [info] Process Execution: /usr/local/python/bin/python -c "import ipykernel; print(ipykernel.version); print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d"); print(ipykernel.file)"
17:59:01.801 [info] Process Execution: /usr/local/python/bin/python -m ipykernel_launcher --f=/.local/share/jupyter/runtime/kernel-v3fd4739cf363fb0b5283d1049a13613c246798044.json
> cwd: ~/cookbook
17:59:02.427 [info] Restarted 7cfbe6f1-a3db-4d77-ab9e-6b47179c0e3f
18:59:16.909 [info] Disposing request as the cell (2) was deleted ~/cookbook/sample.ipynb
18:59:16.909 [info] Disposing request as the cell (2) was deleted ~/cookbook/sample.ipynb
20:17:52.107 [info] Interrupt kernel execution
20:17:52.107 [info] Interrupt requested ~/cookbook/sample.ipynb
20:17:52.109 [info] Interrupt kernel execution
20:17:52.109 [info] Interrupting kernel: python31212jvsc74a57bd0c3ecfbb2e518759e8150e3a4e02d9374d8d11351137435699613669ebcf0f527
20:17:52.111 [info] Interrupting kernel via SIGINT
20:17:52.664 [warn] Cell completed with errors (cancelled)
20:17:52.676 [info] Interrupt requested & sent for ~/cookbook/sample.ipynb in notebookEditor.

Output for Jupyter in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Jupyter)

XXX

[DonJayamanne]

Please can you install an old version of Jupyter extension , last two months and confirm it works as expected
If it does then it’s a bug in the extension, else it’s an upstream issue in ipykernel