When applying a look with an accessory, my avatars head turns metallic in fallback shaders and some other fallback materials break.

Repro:

Select an avatar.

Enable fallback shaders from the avatars section of the radial menu (others see the same when your shaders are disabled as well).

Create a look for your avatar with at least one accessory.

See your fallback appearance breaks.

Video of this occurring attached.

Image of how materials look with an accessory attached.

I've seen this happen to other avatars, but in case this is avatar specific, this avatars ID is: avtr_7fe3df7a-eb5f-4a54-855e-5820589851d0