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: InnoUnpacker (Sep 17, 2025), Platform 30.1 (Sep 27, 2025)
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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.