deleting a timesig changes the nominal and actual time sig to 4/4 regardles of the previous value

1. create new score, with a timesig of e.g. 12/2 (or any other, but not 4/4)
2. select one of the measures and change actual duration
3. trop a different timesit onto some later measure
4. enter notes
5. select the initial timesig and hit Del

expected result: the timesig gets deleted, the score respaced, but nothing else happens, esp. the actual and nominal timesig stays as set before
actual result: the actual and and nominal timsig of all measures (up to the next one) change to 4/4. No notes are lost, but barlines/measures adjust. Changing actual timesig does not revert this, but inserts rests/deletes note (if longer resp. shorter than before)