@runeranch only seeing the image I would say maybe the bed isn’t perfectly level and higher in the back, lower in the front. I haven’t encountered such artifacts in relation to certain movements yet though.
@unixb0y Two X-axis motors. What I did and helped so far is: adjust X-axis belt tension and the belt angel. The teeth of the belt was scraping underneath. Also my nuzzle was crud / not flat. Sanded it a bit and my top layer has improved a lot.