BiaB 2022 for Mac

I'm using the plugin with Luna. When generate 4-5 choruses with, typically, drums, bass, piano, guitar (all real tracks) everything goes ok and I drag the Wave files into the Luna timeline. It's usually at that point that I notice there is only a single chorus of the drum track.

This is occasionally fixed by multiple restarts of Luna but more often that not I can't get it fixed.

Any ideas?