Corruption on deleting initial rest in voice 2 tuplet
1) new score, treble template, 4/4
2) measure 1, note input
3) voice 2
4) 5 Ctrl+3 0 C C (to enter triplet starting with a rest)
5) exit note input
6) select leading rest
At this point, the file is in an awkward position, and while corruption isn't necessarily present yet, it can be induced in several ways. For one, try selecting the measure and pressing "R", for instance) - you'll see the measures gets copied well enough but the one after is rendered corrupt in voice 2, with something other 4 beats of rest. Or try swapping voices 1-2 - corruption results in voice 1 as the rests inserted to fill the beginning of the measure are not part of the tuplet and don't add up.