well, I just have the MTKView and PhotoKit, so I guess NSCollectionView isn't the problem.Now, you're talking about XCode Simulator, so I guess you're getting this error on iOS. In my case, it's actually happening only on OSX and not on iOS. I thought it was somewhere in Catalyst, but I have switched the macOS version to AppKit, hoped the crash disappeared but it just happened to me again.
jmuffat
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Same problem here, XCode 12.3, iOS 14.3 on iPhone Xs max
I was starting to think I was crazy until I found this thread.