I would suggest that if you don’t hear from anyone with similar experience and a solution here, you might want to open a new issue in Issues · jupyterlab/jupyterlab · GitHub.
It might be unrelated, but there was a very recent release of ipywidgets 8 which might have caused some breakages. In particular, there might be a requirement to have a specific version of jupyterlab_widgets with a specific version of ipywidgets installed - we saw some problems on JuypterLab CI.
In any case when opening the issue the full information about the installed versions of all jupyter and widget-related packages will be crucial.