Well in sound when playing the demonstration files. The previous version didn't. Possible clue: first bar first time often sounds OK but thereafter it's all tin. Perhaps starts when chords appear.
New: MKVToolNix (May 01, 2024), Platform 29.5 (Apr 24, 2024)
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Since this doesn't seem to be a MuseScore Portable bug, please post your issues/findings at http://musescore.org/en/forum. There you get help from all MuseScore core developers and the great community.