iOS15にてLazyVGrid子要素の高さが揃わない問題と対策

import SwiftUI

struct MaximumHeightPreferenceKey: PreferenceKey {
    static var defaultValue: CGFloat = 0
    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) {
        value = max(value, nextValue())
    }
}

struct DetermineHeight: View {
    typealias Key = MaximumHeightPreferenceKey
    var body: some View {
        GeometryReader { proxy in
            Color.clear
                .anchorPreference(key: Key.self, value: .bounds) { anchor in
                    proxy[anchor].size.height
                }
        }
    }
}

struct ContentView: View {
    @State var maximumSubViewHeight: CGFloat = 0

    let columns: [GridItem] = Array(repeating: .init(.flexible()), count: 2)

    var body: some View {
        HStack {
            Group {
                Text("Hello")
                    .border(.red)
                    .overlay(DetermineHeight())
            }
            .frame(minHeight: maximumSubViewHeight, alignment: .bottom)
            Group {
                Text("Lorem\nipsum")
                    .border(.blue)
                    .overlay(DetermineHeight())
            }
            .frame(minHeight: maximumSubViewHeight, alignment: .bottom)
        }
        .border(.green)
        .padding(.horizontal, 100)
        .onPreferenceChange(DetermineHeight.Key.self) {
            maximumSubViewHeight = $0
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}