Weird things happening with MuseSound Woodwinds at High Ranges

I recently switched over from MuseScore 3 to take advantage of the new sounds. They sound much better, but weird things start happening when I write higher notes. I just have the alto sax going back and forth between Concert C#5 and B5 on quarter notes, but the B5 always comes out very late, to the point where it almost sounds like harsh swing. If I use anything shorter than a quarter, the B5 doesn't play at all.

This problem goes away if I move the line down an octave, but I'd really prefer not to. It only seems to happen on the Alto Saxophone sound, not Tenor or Bari, but it might on others.

I've attached a picture of the line below.