Edits to system text/tempo marking after save and reload of score do not propagate to all parts.
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 220.127.116.113615790, revision: 12ab1d9
Create a score with two or more instruments
In first bar Add>Text>System text/tempo marking
Create all parts
Save and close
Edit System text in score.
Result: edit is propagated to the first part only. It does not show up on other parts. Deleting the text also only affects the first part.
Edits are propagated to all parts if steps 4 and 5 are skipped - i.e. if the score is not saved before making an edit.
@mike320 confirms and reports this is a regression from 3.5.0.