Lithopane issues random marks

Doesn’t do it all the time just some images hatchbox pla bambu x1c iv tried various minimum and maximum thickness. Zseam is set to back corner.

While these marks do have the look of a z seam since I think I saw multiple marks on the same line this is unlikely.

This may just be an extrusion issues. Have you tried printing a solid test image, in the same orientation, to see if you still get the marks?