I find that when in engrave mode, if you select a dynamic continued from the previous line and and do ctl +shift+A to extend the selection, Dorico crashes.
Interesting. I get the same result using Cmd+Shift+A on mac (selecting the second half of a crescendo after a system break).
This seems to work fine in Dorico 2, so presumably it’s new in v3.
Thanks for reporting this. I can reproduce the problem, and we’ll get it fixed.