Bugs on tempo% slider in the undocked toolbar

4.2.1, Win10 home x64
Selecting a tempo proportion value different from 100% will make the view skip to a very distant part of the score, and it will change all volumes between different instruments.
Things that might be worth checking:
1. Whether it needs to have different dynamics text items changing independently between the various instrument along the score in order to trigger the unwanted volume change (ie, is the change random/related to something else, or is it due to Musescore applying dynamics that are written elsewhere?). A good way to test would be to use a soundfont that has radically diverse-sounding samples at different velocities, I only use MS Basic which doesn't have such a feature to my knowledge.
2. Whether the dynamics getting applied (if it's dynamics and not just mixer volume or something) are those of the part of the score that the focus shifts to.

I wonder if this bug might be related to either the one that causes the playback loop, when activated, to be shifted compared to the selection, or the one causing random volume changes in 4.2.1 even outside of this context.