Found a workaround for using “Set Track” in my audacity macros to change simply the name of a labeltrack: Instead using "SetTrack:Name="NewName" " I replaced it by "SetTrackStatus:Name="NewName" ". That worked for me also in Audacity 3.3.0 without any crash.
BTW: The new beat grid in Audacity is really great and makes a few macros of mine unnecessary.