LandscapeLayerBlend shows a pitch black preview in unreal 5, its owrks perfectly in U4

Hi, when I plug 2 simple textures in the landscape layer blend in my unreal 5 the material ball becomes pitch black. When i individually plug in both textures in the base color they show up fine. I tried the same setup in unreal4 and it works perfectly.

I tired different image format for the imported textures, and also different sizes cause i thought that it could be the problem…

I also updated latest divers from Nvidia to 512. something

My laptop has a RTX 3060 and I thought that should not be a graphic card problem but I guess it might…

Any help would be appreciated, otherwise i would have to roll back to U4