Just adding, because I have made some progress by troubleshooting, but results seem very inconsistent!
I have an (a) eyelash for the character and a (b) large primitive sphere using the same opacity-masked translucent purple material.
In a metallic mirror, while in DX12 Raytrace mode, the
(a) lash on the character reflects back with the right color (purple), but the wrong opacity (none/opaque), but the
(b) sphere reflects back with the right opacity, but the wrong color (should be purple, but reflects back black)
Anyone have any idea what in the heck is going on…LOL…
Mesh UV?
Like, why would the same exact material do 2 completely different inverted things in the mirror!..
Does 4.24 have a crazy random-reflection-response mode, or what am I missing here.