musescore 3 does not preserve instruments other than those of "musescore general sf3". They become pianos ..

For compositions made before the upgrade (3.1.0.7078) this is not a problem. For new compos, made after the upgrade, musescore does not record the chosen instruments. When I open the compo, sax, clarinet, trombone, cello, etc., all those that do not belong to "musescore general.sf3 have become pianos. (The instruments that I have donwload are correctly installed in the synthesizer, default. Every time if I stop working on musescore 3, or I close simply a score, I must reassign the instruments when I open the scores again.