Measurenumber placement not saved

I have a score (origionally created in Musescore 3, then converted to Musescore 4) where I want to have measurenumbers centered below the core for each measure.
I created the measure numbers below the staf, choose show on each staff and then hide the measure numbers on all the staffs except the bottom one.
This works fine.
But then chnage the style to have the numbers shown lower (y position at 5.00p) and this works. But after saving, the next time I open the y position has been reset to 1.00p.
Also my custom chords file need to be reapplied (in the style it shows the custom chord file, but it doesn't use it until I select the default style and then re-apply the custom chord style again).
I think it is a bug, but maybe something went wrong with my score during the conversion from Musescore 3?
Score and custom chord style is attached.