Rests when nominal and actual time signatures are different

When the nominal and actual time signatures in a bar differ, MuseScore treats a full measure rest as referring to the nominal time signature rather than the actual. This results in "File corrupted" warnings when re-opening a score, although it seems to have no effect on playback or, under most circumstances, score layout.

I decided, at one point in the creation of my last score, to fix each of the warnings by replacing the full measure rests with actual rests of the correct value, and discovered this isn't easy or obvious. In many instances, replacing, say, a whole measure rest with a real whole-note rest would result in a bar that contained only a whole measure rest at the beginning despite the length of the bar being--again, for example's sake--six quarters long. When the nominal and actual time signatures are the same, MuseScore adds the extra half-note rest, which is the expected and correct behaviour, but does not always or reliably do so when the time signature values are different.

Worse, I'd sometimes end up with a measure with, say, a sixteenth rest at the end when the correct value should have been dotted-eighth, but MuseScore wouldn't let me delete the rest (so it would auto-correct to a dotted-eigth), nor would it let me select the rest and click in the correct value. The only way to overcome this problem was to start at the beginning of the bar and convert every rest to the smallest value necessary to describe the bar (say, 17 thirty-second rests), then systematically reduce the thirty-second rests to sixteenths, then to eighths, then to quarters, etc. in order to get a bar with the correct rest count.