General Layout issues when importing a Musescore 2.2 score
The score available at https://musescore.com/classicman/scores/33715 doesn't import at all right in MuseScore 4. One particular example is what happens to the bars at the bottom of page 1.
Here is in Musescore 3: 
Here is in Musescore 4: 
Hopefully this is a source of examples.
Comments
Musescore 4 uses a different style/layout method than Musescore 2 does. I think your best bet is to just re-format the layout as you want it to be. Might take some time, but I've had similar issues with importing old scores into Musescore 4 and it doesn't seem to be something that is an easy fix without doing it manually.