Incorrect vertical placement when changing number of staff lines

When changing the number of staff lines mid-score (e.g. for band/orchestra percussion parts), Musescore removes lines starting from the bottom and leaves the top line. Very annoying visually and functionally, and notationally incorrect (I think it should preserve the middle line in 99% of cases). But it also wreaks havoc on the vertical placement of a lot of things on those staves. It seems to calculate positioning based on the ORIGINAL staff, instead of the new one, and so brackets, instrument names, dynamics, and the selection box are all off.

I've attached a score with some examples (non-exhaustive), starting from both a 5-line and a 1-line.

Yes, you can adjust the offset of the staff, which fixes most of this. But then you get lots of element collisions, which on a big score is lots of work; text, dynamics, and most annoyingly, ALL tied notes.

(Another funny behaviour I noticed was when you "add measures before selection" prior to a staff change, the element for the staff change moves but the actual change stays where it is, no matter where the element is. After you do that, the staff change is permanent on that measure, even if you delete the element.)

For now I guess I can adjust ties and stuff manually, but a de-bugging of the change staff type would be really nice, especially for the band/orchestra composers here.