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Reproduction of crash in diffable data source in UICollectionView:
Assertion failure in -[NSDiffableDataSourceSectionSnapshot snapshotOfParentItem:includingParentItem:], NSDiffableDataSourceSectionSnapshot.m:330
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: index != NSNotFound'
The sample app consists of just one screen, List which uses a UICollectionView with a diffable data source. It is configured in such a way that the app unexpectedly crashes when reordering cells in one section followed by cells in another section.
Filed as FB9662195.