RISE slide types not being saved/reloaded

After I create a slideshow using RISE and save the file, then whenever I reload the .ipynb file, all the “Slide Type” info for each cell is gone (i.e. View > Cell Toolbar > Slideshow shows blank “Slide Type” instead of, e.g. “Slide”), so I am forced to go back and re-assign all the slide types.

How to fix this?

I’ve tried this in “Classic NB” mode, and also trying the newer jupyterlab-contrib/rise hasn’t worked for me at all (can’t find the “Cell Toolbar” view or or any way to assign slide types in the contrib/rise version)

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