Regroup Rhythms doesn't handle tuplets correctly
Attach score shows a simple tuplet with just rests:
After Regroup Rhythms the score looks like
The root cause is
Score::regroupNotesAndRests() doesn't take any tuplets into account. When
Score::regroupNotesAndRests() sees a tuplet it should be handles as a separate case and when the tuplet are just all rests, replace it by a normal rest in which case it can be regrouped with other rests.