why does the state reset to null after assignment?

The issue is due to sheet is created before button clicked. The solution for your scenario is to use .sheet(item: approach.

Here is corrected code. Tested with Xcode 12.1 / iOS 14.1

struct ContentView: View {
    class Object: Identifiable {
        let id: String
        init(_ id: String) { self.id = id }
    let collection = [Object("1"),Object("2"),Object("3")]
    @State var state: Object?
    var body: some View {
        List(collection) { item in
            HStack{ Text(item.id); Spacer() }
                .onTapGesture(count:1, perform: {
                    self.state = item
        .sheet(item: $state) { item in


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