Same issue.
Using either .preferredColorScheme or .colorScheme breaks the TabView background and foreground color, especially when changing tabs subsequently.
Also, it seems like toggling back to nil for preferredColorScheme does not have the desired result in general.
Rodgers2024
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution