Microtonal information in Alter MusicXML tag not preserved.
I encountered this bug (or perhaps more fittingly, not implemented feature) when attempting to import musicxml file of the comma pump that Adam Neely mentioned in his recent video. The musicxml file was generated using a slightly modified version of the music21 library.
Steps taken to reproduce the issue:
1) Open xml file with Musescore
2) Save file as uncompressed Musescore3 format
The resulting saved file does not contain any microtonal information. Playback also is not microtonal.