Ties extended in region after time signature change
First reported in https://musescore.org/en/node/297855, then narrowed down from there
If a time signature change requires adding beats to fill out the last measure of the changed region, any times following that region are broken - they miss their end points and are extended to the next note. So for instance, if you have a region of four bars of 4/4 that you change to 3/4, this requires 6 bars of 34 and the last bar gets padded with two extra beats. This breaks all ties from that point forward.
I have attached such a score. Just change the first bar to 3/4 (the time signature change will stop at the 2/4 bar) and all the ties after the first four bars get broken.
The tie into the 2/4 section is not broken, btw, Thus, it seems #277800: Adding time signature breaks a tie across barline may no longer apply. I didn;t investigate that further.