I have a few issues with 2019.3 build alpha 2019.3.046.
on exiting after changing language in preffs I get the following log fragment.
INFO - core.main (19:10:19.440) - MainThread (11692):
ERROR - gui.terminate (19:10:19.440) - MainThread (11692):
Destroyed but not deleted instance of settings dialog exists: <gui.settingsDialogs.NVDASettingsDialog object at 0x0A5EBBC0>
I am testing this mainly to see what addons screw up and what don't to see what needs fixing.