Select/More for rests is broken
OS: Windows 7 SP 1 (6.1), Arch.: x86_64, MuseScore version (64-bit): 3.0.0, revision: 3fdfab3
1) Load this test file: rests selection.mscz
(With Ctrl + A, you can see the rests in different voices)
2) Right-click on a rest -> Select -> More
First observation: the "same subtype" box, for rest so, is greyed
And the result is: all selection fails by ticking, "Same staff", "Same voice", "Same system", "In selection", etc.
An exception: "Same duration" works.