I will do it in separate threads for each map-task!
And I was able to get the map even though I only head a “dead” slice, my understanding was that it should only be “StableOK” or active slices that are displayed?
Have you tried some of the stuff mentioned here?
https://stackoverflow.com/questions/44800396/python-ipyleaflet-export-map-as-png-or-jpg-or-svg