Hidden shadows aren't rendered when ray tracing is enabled.
Found in 4.25 Preview 2 CL#12055273
Reproduced in 4.23.1 CL#9631420, 4.24.3 CL#11590370, 4.26 Main CL#12123513
1. Create a new blank project and enable ray tracing.
2. Add a cube(DemoCube) to the scene.
3. Enable "Actor Hidden in Game" and "Hidden Shadow" in DemoCube.
4. Press G or play the scene.
Expected: DemoCube's shadow is still visible.
Result: DemoCubes's shadow isn't visible.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-90632 in the post.