Unity 2019.7 => Artefacts square with my textures

Hi,

I am currently testing Unity 2019.7 and I have artifacts that appear on my textures. Some kind of place I don’t have in 2018.

Do you know if it’s a configuration problem?

(This is a new project, without modules / plugins, tools)

Thank you for your help

Found, it’s my NormalMap texture…

Sorry for the inconvenience:)