CTRL+mouse down on a movable element results in loosing focus
If an element has a focus, then:
1) mouse down + SHIFT allows to move it vertically
2) SHIFT + mouse down allows to move it vertically
3) mouse down + CTRL allows to move it horizontally
4) CTRL + mouse down, the element just looses focus and no movement is possible.
If an element didn't have a focus before mouse down then all combinations work fine, though.
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 126.96.36.19935, revision: d2d863f