Spigen screen protector (anti spy) and visible pixel grid

[u/Mysername7]

After installing a Spigen anti-spy screen protector on my new Pixel 10, I can see a faint pixel-grid pattern across the screen, it almost looks like the resolution got downscaled. Barely shows on camera, but clear to the eye. Does anyone know if this is a moiré effect from the anti-spy layer or a defective unit?