Related to this: SwiftUI duplicated border in VStack/HStack

How can I avoid a duplicated border in a grid if I do not draw every single tile? The proposed solution seems to only work properly if all borders between tiles are drawn.

struct LeastQueensView: View {
    var tileList: [(Int, Int)] = [(1,1), (1,2), (1,3), (2,3), (2,1), (3,3), (3,4)]
    var maxX = 3
    var maxY = 4
    
    var body: some View {
        grid
    }
    
    var grid: some View {
        Grid(horizontalSpacing: 0, verticalSpacing: 0) {
            ForEach((1...maxX).reversed(), id: .self) { i in
                GridRow {
                    ForEach(1...maxY, id: .self) { j in
                        if tileList.contains(where: {$0 == (i,j)}) {
                            ZStack {
                                Rectangle()
                                    .foregroundColor(.gray)
                                    .aspectRatio(1.0, contentMode: .fit)
                                Rectangle()
                                    .strokeBorder(lineWidth: 1)
                                    .aspectRatio(1.0, contentMode: .fit)
                            }
                        }
                        else {
                            Rectangle()
                                .aspectRatio(1.0, contentMode: .fit)
                                .foregroundColor(.white)
                        }
                    }
                }
            }
        }
        .padding()
    }
}

All borders in between grey tiles are doubled while borders adjacent to a white tile are not.