Imagingfag here. The patterns here are regular and symmetrical. It really looks like this could just be antialiasing 'beat' patterns. Unless you see some assymettry there, you're probably looking at regular algorithmic noise.
Not sliding you if you want to try to find meaning in it, but I've been doing imaging algorithms for my entire life and when it is regular like that, it is probably just the artifacting from a regular filter.