The bug seems to not be entirely fixed, but it is different/better now- it results in a mixed screen like this when you click back. Clicking the options menu fixes the game with no reload, so this is already not nearly as annoying as the old bug.
The error message is also different:
**SCRIPT ERROR**: Invalid call. Nonexistent function 'queue_free' in base 'GDScriptFunctionState'.
At: res://Scripts/Root.gdc:4007:_root.w_tabkey_assist_lored() - Invalid call. Nonexistent function 'queue_free' in base 'GDScriptFunctionState'.