Ledger lines don't change size/location when crossing staves from normal to small staves
In screenshot 1 you can see the notes are far above the ledger lines they are supposed to be on.
In screenshot 2 you can see the correct notes on the right ledger lines when crossing from staves of same size.
Comments
I can confirm; please report this over on GitHub - https://github.com/musescore/MuseScore/issues