belt ripples artifact

Hi. I have belt ripples artifact (sometimes called salmon skin), in general - vertical pattern which exactly matches belt teeth distance. Printer - no mods, just vcore 3.1 300mm kit. I discovered that it is more strong during Y movement, but also very visible on X. What I found strange - it is stronger on movements from Ymax -> Ymin and Xmax -> Xmin, so on different sides of the model it has different visibility, like that:
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