Disappearing dynamics markings

I've notice that when I open a MuseScore 3.X orchestral file in MuseScore 4, and then re-add the parts that were in my older MuseScore file, none of the dynamic markings (crescendos, diminuendos) will appear in the parts, even if they're in the conductor's score. I have to manually delete each one and then re-add it within the parts themselves. Re-adding them to the conductor's score still gives me nothing in the parts. The same is true of other markings such as trills. The dynamic labels (mp, f, etc.) do appear in the parts though.