Zoom-pan doesn't follow continuation of secondary voices into a new measure's rest in note-entry
As stated in the title, but maybe that wasn't the best way to describe it. A video capture demonstrates (the bottom portion is the actual bottom of MuseScore's score-view window and not merely a windowed video capture (first portion is how it works in first-voice, second portion is the lack of panning view with second-voice):
Something is being calculated with the First-Voice during note-entry while moving forward per chord that isn't being taken into consideration when using the second-voice (probably also the third/fourth voices).
Main point: the measure being moved into has a whole-rest. When there is a note value there, the problem doesn't occur.