Beam separates from stems when crossing staves.
Steps to reproduce bug
1. Open blank grand staff.
2. Add a few beamed notes to the bottom couple of lines & spaces on the top staff (quavers, semi-quavers etc.)
3. Select a complete beamed group and use ctrl + alt + down arrow to move to the lower staff.
4. Press x to invert the stems & beams.
Expected behavior: Beamed group will display in the same note position on the lower staff with the beams & stems pointing down.
Actual behavior: Beamed group displays in the same note position on the lower staff with the stems pointing up and the beam where it should be below the notes.
Discussion: Inverting further or returning group to top staff does not correct the problem as the beam remains detached from the stems. Using undo also does not return the beam to the correct location attached to the stems. To correct, you need to undo until the entire group is no longer on screen, then redo until the notes are present once again. At this point the beam will be attached to the stems once more in the original position on the top staff.
MuseScore version: OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 188.8.131.5247, revision: 96c1f7b
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