crach on Musescore App

I use the app Musescore 2.12.22 on Iphone SE with iOS 16.1.2.

When I open an MSCZ-file from mail attachement, it is placed in my songbook. If this score has no title or title with unsupported caracters, , it is recorded in the songbook with a sequence number, e.g. 1234567891. So far so good. But when I want to delete such a numbered file (via menu with three dots) then Musescore crashes with a blue screen and I have to restart.