Cannot see cell output

### Describe the bug I was running a marino notebook in VSCode extension when I noticed that there is no cell output. After checking the underlying py file and manually adding the return variable, I still had the same problem. Restarting Kernel, updating all extensions and VSCode does not fix the problem ### Environment <details> ``` marimo VS Code Extension Diagnostics ===================================== Language Server (LSP): UV Bin: Bundled (/Users/ruslan/.vscode/extensions/marimo-team.vscode-marimo-0.12.6-darwin-arm64/bundled/libs/bin/uv) UV: 0.11.3 (45da18ac3 2026-04-01) ✓ Using bundled marimo-lsp via uvx Python Extension: Interpreter: /Users/ruslan/NMR_distillation/CSP5/.venv/bin/python Version: 3.10.20.final.0 Python Language Server (ty): Status: running ✓ Version: 0.0.26 (940305127 2026-03-26) Binary: UvInstalled (/Users/ruslan/Library/Application Support/Code/User/globalStorage/marimo-team.vscode-marimo/libs/bin/ty) Python: /Users/ruslan/NMR_distillation/CSP5/.venv/bin/python (3.10.20.final.0) Ruff Language Server: Status: disabled Reason: Ruff extension (charliermarsh.ruff) is not installed. Extension Configuration: Version: 0.12.6 UV integration disabled: false System Information: Host: desktop IDE: Visual Studio Code IDE version: 1.117.0 Platform: darwin Architecture: arm64 Node version: v22.22.1 Common Issues: 1. If notebooks won't open: - Check Python interpreter is selected - Ensure marimo is installed - Check 'marimo-lsp' output channel for errors 2. If features are missing: - Ensure marimo version is >= 0.23.2 - Try reloading the window ``` </details> ### Steps to reproduce I just ran the notebook, to which I have written some code using GitHub Copilot. Code written in new cells no longer generates any output. Restarting Kernel, updating all extensions and VSCode does not fix the problem