SwiftUI drawingGroup() method seems to be bugged when its applied to a view that was build with a ForEach

In SwiftUI when using .drawingGroup() to flatten a View, I get different results than expected if the view builder uses a ForEach. Example code below results in a view that incorrectly shows only two Circles. If I comment out the .drawingGroup() call then the View correctly shows four Circles in a diamond formation.

Is there a way to get around this? When the .drawingGroup() works its seems pretty effective in improving memory performance and I would like to use if I can.

struct DrawingGroupView: View {
    var offsets = [CGPoint(x: 0, y: -1), CGPoint(x: -1, y: 0),
                   CGPoint(x: 1, y: 0), CGPoint(x: 0, y: 1)]
    var width: CGFloat = 90
    var body: some View {
        ZStack {
            ForEach(0..<4) { index in
                Circle()
                    .offset(
                        x: offsets[index].x * width,
                        y: offsets[index].y * width
                    )
                    .frame(width: width)
            }
        }
        .drawingGroup()
    }
}