Brass and vocal dynamic oddities

I'm absolutely loving MuseScore 4. What a wonderful holiday present! Kudos to all the developers! I've been putting it through its paces with lots of complex orchestral pieces. So far I'm blown away by the improved instruments. The only issue I've run into is dynamic markings for brass and vocal lines. Both of those are rendered far quieter than the marking indicates. On playback, a MF renders more like PP. Other instruments don't seem to be affected as badly. A trombone playing MF in an orchestra should cut through pretty well. But in MuseScore it's inaudible. I've had to compensate by cranking up the mixer levels.