GlassEffect not utilized on button border

I am attempting to attain having a GlassEffectContainer with some buttons and the choose button has a crimson backside border.

My solely subject is that the glass impact is not being utilized on the background the place the border is added.

struct GroupedGlassBorder: View {
    
    @State var chosen: Int = 1
    
    var physique: some View {
        GlassEffectContainer {
            HStack {
                BorderButton(title: "One", num: 1, chosen: $chosen)
                BorderButton(title: "Two", num: 2, chosen: $chosen)
                BorderButton(title: "Three", num: 3, chosen: $chosen)
            }
        }
        .glassEffect()

    }
}

struct BorderButton: View {
    
    var title: String
    var num: Int
    
    @Binding var chosen: Int
    
    var physique: some View {
        Button {
            self.chosen = num
        } label: {
            Textual content(title)
                .padding(12)
        }
        .background(alignment: .backside) {
            Capsule()
                .body(peak: 2)
                .foregroundStyle(chosen == num ? .crimson : .clear)
        }
        
    }
}