MatchedGeometryEffect Matches Without Source (FIXED!)

If two views have a call to matchedGeometryEffect, with the same id and namespace, and both calls have isSource = false, the views SHOULD NOT match. However, the framework picks one of the views to act as source and the match occurs.

Bug Report: FB7968204

Workaround: No, use a combination of id and namespace not currently in use.

Last Version Checked: Xcode 12, Beta 4. Fixed in Beta 4!

Sample Code

struct ExampleView1: View {
    @Namespace var ns
    
    var body: some View {
        HStack {
            Rectangle().foregroundColor(Color.blue)
                .matchedGeometryEffect(id: "id1", in: ns, isSource: false)
                .frame(width: 100, height: 100)
            
            Circle().foregroundColor(Color.green)
                .matchedGeometryEffect(id: "id1", in: ns, isSource: false)
                .frame(width: 100, height: 100)
        }
    }
}

This is the outcome: