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- we can't correctly cache and invalidate InstanceMaskAndFlags in proxies since it depends on state that is not available in Engine module. - moved caching of dynamic raytracing primitives mask and flags to RayTracing.cpp - cached data is stored in FPrimitiveSceneInfo similar to primitives using cached raytracing instances. - proxies can indicate that cached data needs to be invalided using bInstanceMaskAndFlagsDirty flag in FRayTracingInstance (for example when LOD changes) #rb chris.kulla [CL 31559621 by tiago costa in 5.4 branch]