SwiftUI - Global coordinate space is flipped on macOS

Behavior of reading frames through GeometryReader is confusing on macOS.

Apparently when you read a frame in local or named coordinate space, returned frame is in the "SwiftUI coordinate system" where the (0,0) point is in the upper-left corner.

However, when you read a frame in a global space, returned frame is in the "native macOS system" where the (0,0) is in the bottom-left corner.

Is this behavior documented anywhere or is it a bug?
I would suspect SwiftUI to always return frames in the same way on all the platforms.

I'm trying to figure out if I'm missing something here.

My sample code:

Code Block swift
struct ContentView: View {
var body: some View {
    ZStack(alignment: .bottom) {
        Color.blue
            .frame(width: 100, height: 150)
        Color.red
            .frame(width: 20, height: 60)
            .background(
                GeometryReader { geo -> Color in
                    let g = geo.frame(in: .global)
                    let s = geo.frame(in: .named("stack"))
                    print("Global: \(g) | Stack: \(s)")
                    return Color.purple
                }
            )
        .padding(.bottom, 5)
    }
    .padding(40)
    .coordinateSpace(name: "stack")
    .background(Color.pink)
}

Output:

Global: (80.0, 45.0, 20.0, 60.0) | Stack: (80.0, 125.0, 20.0, 60.0)