Unexpected behavior with Spacers in SwiftUI Toolbar

I'm seeing unexpected behavior with the SwiftUI Toolbar. This code works but the items are grouped together in the center of the toolbar (as expected). However, if I add the two Spacers everything disappears.          

   ToolbarItem(placement: .bottomBar) {
              HStack {
                Button(Constants.Buttons.Location) {
                  print("button")
                }
                //Spacer()
                Image(systemName: Constants.Icons.Share)
                //Spacer()
                Button(Constants.Buttons.Website) {
                  print("button")
                }
              }
            }

If I add them all individually (including the two Spacers) I get the result I was expecting.

       ToolbarItem(placement: .bottomBar) {
        Button(Constants.Buttons.Location) {
          print("button")
        }
      }
      ToolbarItem(placement: .bottomBar) {
        Spacer()
      }
      ToolbarItem(placement: .bottomBar) {
        Image(systemName: Constants.Icons.Share)
      }
      ToolbarItem(placement: .bottomBar) {
        Spacer()
      }
      ToolbarItem(placement: .bottomBar) {
        Button(Constants.Buttons.Website) {
          print("button")
        }
      }