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@lisyarus
Does changing the roughness improve or worsen the effect? If so, it would suggest precision loss somewhere in the BSDF.
Dividing by a variable less than 2^-23 is the usual suspect.

An rng bug could maybe introduce patterns, too, but most likely the BSDF.

I tend to reject sampling pdfs below 1e-6 since it will likely introduce either a firefly or +inf