1. Open CaveScene in user attached project
2.a) If on mac set graphics API to OpenGLCore
2.b) If on windows set graphics API to Direct3D11 or OpenGLCore
3. Fly above sign and try to illuminate it(see ShadowsDoesntWork.png)
Notice shadow does not appear.
4.a) If on mac: switch graphics API to OpenGL2 or Metal
4.b) If on windows: switch graphics API to Direct3D9
5. Fly above sign and try to illuminate it(see shadowsWork.png)
Notice shadow does appear.

Repro on: 5.4.0b22, 5.4.0b23
No repro on: 5.4.0b21;