Seeing the same thing. We're using automatic provisioning though. Anyone figured out a fix?

Seeing the exact same issue - why it says "UICollectionView.." is beyond me, probably a bug. But did you figure this out? It does work if you set a symbolic breakpoint for NSCollectionViewFlowLayoutBreakForInvalidSizes

I've got the same issue in our app. We get infrequent crashes in scrollWheelWithEvent and we have absolutely no idea how to prevent them.

Were you able to find a solution to this?

That doesn't work. AppKit still seems to handle any mouse movement over a NSTextField even if there's another view on top.