Latex not always typeset in ipywidgets in Jupyter lab

I have been intermittently seeing latex labels in ipywidgets not rendering in Jupyter Lab. I would like to report an issue, but am not sure I have checked everything I need to. At first I thought it was an issue with widgets >= 8.0. But it is now being reproduced with the latest jupyter lab and widgets before 8.0. The behavior is quite strange. I only encounter it in the first notebook I open after launching lab, but not 100% of the time (about 90%). If I close the first not working notebook and open a second one the same widgets have latex labels properly rendered.

I have tried complete new installs into virtual environments. Some seem to work fine some do not.

Has anyone seen anything like this? Any hints?