Problem:
SwiftUI render wrong size on old device like Apple Watch Series 4.
The height was be cut, not well render as series 6 or simulator.
Check the screenshots.
BTW:
But it works well both on watch series 6 real device or simulator.
Reproduce：
Download “Build a Workout App for Apple Watch”, run the code on a real device of watch series 4 https://developer.apple.com/videos/play/wwdc2021/10009/
On Watch4-44 mm (first line be clip)
On Simulator or watch 6.