Changing instrument in the mixer resets playback but not the playback marker
1) Open score.
2) Begin playback of music. Playback marker tracks playback point correctly.
3) Open mixer.
4) Change sound of instrument to anything else.
5) Bug occurs. The playback for the Instrument that was changed reverts back to the beginning of the score, the rest of the playback continues at the current point in the score.
This leads to the instruments that have been changed being out of sync with the playback of the rest of the score.
For scores with one instrument, the playback marker continues to track through the score at the point the sound was changed however the actual playback reverts to the beginning of the score.
I was able to repeatedly replicate this across multiple scores in Musescore 4.