GeometryReader was not part of fizzbuzz. Replace geo.size.width * 0.1 with 10 to see your code break.
Now tell me, why did it break? Do you even know? Because I don't.
I don't know why half the shit works as it does, and I've written non-trivial SwiftUI code for 6 months. I did not have this problem with UIKit and interface builder.