Importing MIDI or Capella files can create corrupted or empty measures
When you import a MIDI or Capella file, Musescore will often create completely empty measures (containing nothing at all, not even rests). Frequently in MIDI files, a part that has no more notes after some point in the score will simply end early.
Example: AnSylvia.mid, in which the vocal part is completely empty starting with measure 27 (I chose 64th-note minimum when importing, but that probably doesn't matter).
That doesn't matter when playing back a MIDI file, but they should get filled with rests when imported into a scorewriter. Screenshot:
Further, due to the related bug #9808: Empty beats/measures can't be selected or refilled in UI, the user cannot fix the empty measures after they are created by this bug. The UI doesn't seem to let you select them or enter notes into them.
Occasionally, I also see a corrupted (partially-filled) measure, in which the contents add up to less than the full time. Example: BWV_1016_3.cap; when imported into mscore 1.3 rev 5702, the second-to-last measure of the middle staff is short one 24th-note (triplet 16th-note).
Musescore should detect corrupted measures and fill the gaps with rests on import.
Possibly related: //musescore.org/en/node/12445