Great find using the custom introspect to pull out the collection view!
betelgeuse90
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By the way another thing that seemed natural to try was to dismiss by changing the @Published property to false instead of calling dismiss(). This worked, but the warning was still there.
Wondering the same thing. I have logic in my ViewModel that subscribes to the state of that @Published variable. If the view were to own it fully as a @State variable, it'd have to propagate that state back to the model on every change, which doesn't even seem possible to do when the sheet is dismissed with a swipe. Even if it was, it's highly undesirable to maintain duplicate state.