Soprano Sax sound in MuseScore 4 becomes 'fuzzy' because of only one note added

I have a problem with Soprano Sax in MuseScore 4. It sounds nice and clean (see the attached file "sax_clear_of_56.mscz"), but if I just append one note in a new dynamics to the score (attached file "sax_dirty_of_57.mscz") it starts sounding as if there is a piece of paper in the reed or something. Besides some notes are not played at all - you only hear a kind of exhaling sound (check the last notes in the 2nd and the 6th measures of "sax_dirty_of_57.mscz"). Same panning, same volume level, same sound font and the same master volume level, only one note added at the end. Why is it so? And what should I do to add more notes without forfeiting the clarity of the sound?
sax_clear_of_56.mscz
sax_dirty_of_57.mscz