Sextuplets display as triplet, corruption on copy/paste
A regression in master compared to 3.0.5, presumably due to the Fraction change.
1) new score in 4/4
2) note input mode
3) 5 Ctrl+6 to create a sextuplet in the space of a quarter
Result: the sextuplet created shows six sixteenths but a "3" in the bracket instead of a "6".
4) enters notes to replaces the sixteenth rests
5) copy the full tuplet
6) paste to the next beat
Result: the fourth note is missing, replaced by an eighth rest, thus indicating a corruption (and further corruptions if you undo, or copy the copy, etc)
According to the object debugger, the baselen is 16th, which seems correct, but the ratio is 3:2. This probably should have been left 6:4 and not reduced. And sure enough, if I use Add / Tuplet / Other to enter 6:4 as the ratio explicitly, then it works correctly - the 6 is displayed in the bracket, and copy/paste works normally.