UE5 Nanite Landscape bug

Trying to setup nanite landscape with 5 simple materials but every time I try to work with, it generates these kind of results.

Any idea what could cause this? Thanks

Similarly I got another issue, seems the tesselation is weirdly skewed.

ever figure this out?

I saw this in the landscaper plugin from ludic drive…. If anyone else has this problem do not create your terrain with it automatically setting up size. Input manual settings for the number of sections and all that. Then it works fine.