Originally Posted by Soli Deo Gloria
tuplet creation is buggy when set to high or low voice. Default voice is fine, as far as I could see.
AFAICT the bug is that setting the voice in the tuplet dialog does not change the voice of the selected notes, though it does change the note positions/durations if that setting is enabled. If the selected notes are already in the correct voice, then the dialog works as expected. Does that match what you are seeing?