watchOS: SwiftUI Runtime Error When Using StateObject/Observed Object

Originator:alelinapps
Number:rdar://FB9792055 Date Originated:12/02/2021
Status:Open Resolved:Open
Product:watchOS Product Version:8.0+
Classification:Unexpected Behavior Reproducible:Yes
 
Using a StateObject in a view to show different views depending upon certain app state. This has worked in the past, and works currently on iOS. However, when trying to run on watchOS is causes the following runtime error:

runtime: SwiftUI: Accessing State's value outside of being installed on a View. This will result in a constant Binding of the initial value and will not update.

An ObservedObject causes the constant Binding occurs. With a StateObject, the UI works, but the error remains.

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