The preview is build by Xcode 26.0 beta 4

Adding two top leading buttons is just for compare. Even one button, layout is also messed. The difference between two buttons, one using label directly, the other using empty view but update label by custom button style. I can use fixedSize to make button looks good, but iOS 18 works fine without this modifier. So, I'm wondering if it's a bug for iOS 26.