Why there black grid (lines) on my mesh?

I’m getting them in LookDev. They only disappear when I turn off show overlays, but there shouldn’t be such lines on a mesh even with overlays.

You have Wireframe checked in Overlays? You’re in Edit mode?

Negative. Negative.

Check the object tab (cube) under Viewport Display for that object, does it have wireframe selected?

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