Illustrator Overprint Preview shows grids?

Whenever I enable Overprint Preview Illustrator seems to add grids on/over my document.
When I disable it, it dissapears.
I find this strange because to me the opposite sounds more logical.
Will these grids be printed if I choose to print?

Indeed, Victor,
Overprint Preview is an approximation of what you may call an ink preview, to (more or less) show how all the parts of artwork will interact and appear in print; this means that to a certain extent you see through the topmost artwork (parts).
This see through then includes the grid which becomes visible underneath the artwork and not merely round it as in (normal) Preview.
So no problem, maybe a bit of a curiosity.

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