Did you every figure this out? Apple support is painful - I guess the only way to get a response is to file developer bug tickets.
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It is crazy that you can't at a crash even figure out the element that SwiftUI was trying to render... I am having a similar issue when using 'delete' in List of a ForEach - the SwiftUI framework is calling back into my collection using an index - but the index doesn't exist because it was deleted. It shouldn't be using the index anyway - as the backing data structure is Indentifiable and Hashable.