I have purple ones sometimes but it's not everywhere. I don't know of a fix and since it is confined to just a few areas, I ignore it. I have played about a dozen hours and have already had at least 5 bugs. Quality assurance department at Ubisoft doing a bangup job as usual.

Its perhaps you push too much graphics preferences, and/or some apps on background it too much gpu memory. Its happen for me yesterday, but i through it was because im start using lossless scaling app to replace crappy upscaler/framegen in game. Actually, it works pretty well.

Happens to me from time to time.

I'm running an i9, 32 gig ram, Evo 970 NVMe and a 3070ti.

I let the GeForce Experience app configure the settings.

This happens in GMOD when you don't have the mods/textures/models installed.

Is your game installed correctly, and are your video card drivers?

Yep also here but only sometimes Pink Square Textures everywhere on the ground.
But Ubisoft have left the game so will have to live with it.