MacOS 39501b5 Copy Paste drumline from one project to another causes random crash if drumline in new location has existing notation

MacOS 39501b5

HI seldomly when I am copying a drumline approx 100 bars from one piece to another - (creating an arragement from separate files into a new file), I paste the drumline into the new file and the app sometimes crashes.

it isnt very repeatable, I have not been able to repeat except when the drumline has some existing notation so work around is to delete all before pasting, only commonality I have observed to cause so far. the drumkits are the same and there are no tripplets or tupplets repeats or accidentals some noteheads near the end of the piece are crossed.