Any idea what is causing this?
I've used UMA and Mixamo Fuse and they both have this issue. It doesn't seem to be a z-fighting issue and the camera clip planes are very low (0.3 to 10).
I'm using Unity 2020.3.22f1 and AC 1.74.3. The platform is Android and I'm using linear colour space.
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Hard to say, but it looks like it might be a lighting/normal issue.
I don't expect it would be AC-related, however. AC won't affect the way character models are lit or shaded.