Instrument parts missing notation
This occurs in the MuseScore desktop app.
When adding notation to different (such as crescendos and decrescendos), it appears on the main score just fine. However, when viewed from parts using the parts feature, instruments will be missing some notation. Crescendos and decrescendos are currently the known examples ones that disappear.
Comments
Unfortunately this is a known issue for which a solution is sought, see for example
https://musescore.org/en/node/361348, and
https://github.com/musescore/MuseScore/issues/21286
I've had the same problem, and, in the end, the only solution for me was to check the parts again and manually, with a pencil, add missing dynamics etc.