Flickering in 4.21.2 vs. 4.21.0

Just went from 4.21.0 to 4.21.2 and now I’m getting severe flicking on certain objects/materials. Once I get closer, or view from a different angle, the issue goes away.

Co-planar surfaces are not the issue.
The wood wall is obviously a bitmap texture, but the pantry millwork is a solid color (no bitmap from Vray).

Wood wall and millwork are giving me vertical or diagonal lines - that shift as you move - almost like bad anti-aliasing.

This was absolutely not happening in 4.21.0.

Any ideas what might be going wrong?