Cmd-click select all staves-measure doesn't move play cursor
OS: macOS Mojave (10.14), Arch.: x86_64, MuseScore version (64-bit): 3.1.0.22177, revision: 66b30c3
Click on some note. Start playback. Stop playback. Click on some whitespace. Now Cmd-click somewhere else to select all staves of that measure. Start playback. It continues from the place playback left off, not the selected measure.
You have to click on the whitespace because unless you do that, Cmd-click will not even be accepted.