Importing XML generated in Finale

I am in the process of changing from Finale to Musescore, since sometime in 2021. What I do is creating a XML file in Finale and import that in Musescore. When I did that in version 3.6.2 then I still had to edit things. Sometimes minor sometimes more depending on the complexity of the score (all scores are for windband/concertband). Now I tried this in Musescore 4 and the edits still have to be done. That is not the main problem. But I can't get the parts that have to be generated look like I want them. Somehow some changes in the score aren't duplicated in the parts. Some part names aren't named properly. And when I make changes to either the part or the score, they somehow get lost when I save the file, close it and open it again.
Today I started again on the score I used to test this with, from the xml file. What I now tried is opening the xml in Musescore 3.6.2. I then check the existing parts, their names and their transpositions. And save that file. I then copy that file to Musescore 4 and continue the editing of parts and adding parts in other transpositions or with other cleffs. But again I have problems: Changes to the layout of parts get lost after saving and reopening. And from parts that I added (for instance Horns in E-flat) the names I gave to that part get changed back to the names they got when I added them. For instance: I add horns in E-flat for horns 1-3 and horns 2-4. They get generic names (horn in Eb and horn in Eb (2)). I change that to horn 1-3 (Eb) and horn 2-4 (Eb) but after reopening they are named back to horn in Eb and horn in Eb (2). I guess I will keep doings this in Musescore 3.6.2 but I wanted to mention it overhere. I will try this again in Musescore 4 when the first update arrives.