Ambient Occlusion gets artifacts if Preserve Tilling is turned on.

The artifact are best described as a faint impression of a gabled roof top.

I'm converting older generic textures into PBR
Work flow to see the issue.
Add a diffuse repeatable concrete wall texture. Some roughness but no pattern.
Use the AI Image to Material
Notice a little seam on the edges of the textures.
Turned on Preserve Tilling
Tweaked the roughness settings some
Export as tga
See the artifact.