Problem with material in packed game

I have a problem with landescape, it show section of landscape with line if i use just 1 color material, or if i use an automaterial, sections of landscape will be drawn with 1 texture from that material, this did happen in 5.6, i waited for 5.6.1 update wich didn’t change anything.

I tried:

-New map
-New fresh project
-Changed material, even used just green color in project i work and new project with same result

Material look like this:

Viewport look like this:

Packed game look like this:

I didn’t find any way to fix it, i replaced the landscape, new material, created a new map, a new project i get same result.