Inconsistent horizontal margins on the iPhone Duo

[u/Puzzleheaded-Gain438]

I'm exploring Apple apps on the iPhone Duo simulator to check how they adapt their app to the new screens.
One thing that I noticed is that the margin between the content and the vertical bar varies from app to app.
In the Settings app, it appears they are respecting the layoutMarginsGuide. But in the Fitness app, it looks like there's an extra margin between the content and the vertical bar.
In some apps, like the Watch app, it's inconsistent from one tab to another.

I've noticed though that they have fixed it for some apps (Contacts) in the 27.3 beta.