Hi Andre,
thanks for the report, I see the issue is due to GTK library:
Gdk:ERROR:../../../../gtk/source/gtk+-3.24.33/gdk/quartz/gdkdnd-quartz.c:44:_gdk_quartz_window_drag_begin: assertion failed: (_gdk_quartz_drag_source_context == NULL)
Searching this error online finds similar crash already reported here (and closed 1 year ago):
Similar issue happened even before (11 years ago, dragged for years, closed 3 years ago):
Will rebuild GTK stack on macOS, hopefully this weekend. Let me know if you want to test if this fixed your issue.
Regards,
Miro