SwiftUI does not evaluate elseif correctly?

I am creating a SwiftUI view where I have three possible conditions, and want to show different content based on which condition is met. A simplified example:

struct ContentView: View {

    @State var condition1 = true
    @State var condition2 = false

    var body: some View {
        VStack {
            if condition1 {
                Text("text1")
            } else if condition2 {
                Text("text2")
            } else {
                Text("text3")
            }
        }.onAppear {
            DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
                self.condition2 = true
            }

            DispatchQueue.main.asyncAfter(deadline: .now() + 4.0) {
                self.condition1 = false
            }

            DispatchQueue.main.asyncAfter(deadline: .now() + 6.0) {
                self.condition2 = false
            }
        }
    }
}

What I expect to happen:
1) The UI shows text1 when the app starts
2) The UI still shows text1 after 2 seconds (both variables are true)
3) The UI shows text2 after 4 seconds (condition2 is true but condition1 is now false)
4) The UI shows text3 after 6 seconds (both variables are now false)

What actually happens:
1) The UI shows text1 when the app starts
2) The UI shows text1 after 2 seconds
3) The UI shows text2 after 4 seconds
4) The UI continues to show text2 after 6 seconds

Weirdly enough, if I put breakpoints in the UI code, the line showing text3 is executed, it just seems the UI never updates. Even more weirdly, if I put a Spacer().frame(width: 0, height: 0) in that else case, everything works as expected.

Is this a bug in SwiftUI or what's going on here?