So I am trying to render a geometry with “render geometry as subdivision” turned on and am noticing weird flicking in the textures. Not noise really, but small groups of pixels changing how the texture looks in random locations. I can also see what looks like fine black concentric lines on the model, kind of like a weird displacement issue. If I turn off subdivision then the effect goes away.

I'm only using a diffuse and roughness map with the principled shader. The objects is pretty matte with low specularity, high roughness, and no fancy features like SSS turned on. My super-sampling is cranked up to 8 in mantra and for troubleshooting I've turned off secondary bounces.

Looking on the forum, it seems that Houdini's had trouble with subdivision in the past. Is this still an issue?