I’ve made tools to put down on the canvas to make this tilable moss texture, and i’m getting this problem now.
The shading all turned into edgy lines after I closed the document and reopened it. Maybe because it crashed earlier when I was doing a Best render.

it’s supposed to look something like this:

Can’t find this anywhere online or i’m wording it wrong in the search. Restarting didn’t work either, this seems to be the only doc that’s doing this. The one other time i’ve seen this is when trying to inflate a plane with displacement map.
Does anyone know what’s going on?