ue5-main branch path tracing glass material with metallic greater than 0 perform different as 5.1 release

ue5-main branch commit: af41d6d20a5c82c093396b65d5c2bf401e0e3457
Look at the glass material of statue on the table of StarterContent, ue5-main branch look like as metal. The metallic of the material is 0.9. Is ue5-main change the metallic behavior? Thanks.
ue5-main branch image:


release 5.1 image: