Manual position of rehearsal marks & tempo text in parts not preserved on save/load

Windows 7, GIT commit: 3543170

1) open attached score text_position.mscz
2) view flute part
3) drag the text items elsewhere
4) view score again, change any note
(this step is necessary because of #22620: Change to linked part does not mark anything dirty - an increasingly major annoyance for me)
5) save
6) load score again
7) view flute part

Result: the "flute text" retains its position, the rehearsal marks has reverted
Expected result: all texts retain position

This score also shows a problem where tempo text is not displayed at all. I'll report that separately.