Finally fixed on iOS 27.2 Beta 4: .soft works correctly even when built with iOS 26 SDK.

Still reproducible on iOS 27.2 Beta 2.

Still reproducible on iOS 27.2 Beta 1.

Still reproducible on iOS 27 RC.

Still reproducible on iOS 27 Developer Beta 8.

Still reproducible on iOS 27 Developer Beta 7.

Not fixed. Still no fade/blur on iOS 27 Developer Beta 6, but only if built with Base SDK = iOS 26. This is a compatibility regression: the same binary works correctly on iOS 26 but breaks after updating to iOS 27. This breaks a large number of existing App Store apps that have not been updated by their developers. My related Feedback ID: FB24246975.