Open MusicXml with tied unisono notes displays tied but sounds untied.
Reproduction: Create a .mscz file having tied unisono notes. Displays good. Sounds good. Now export to .musicxml file. File contents look good in text editor. Reopen .musicxml file in MuseScore and the ties still display OK, but sounds like untied notes. Is this a known bug? I attached simple example files. MuseScore 2.3.2, Windows 10.