[HELP] Geometry issues

Opened my project in the 4.8 version and found some artifacts - it seems that the grid pattern is rendered differently now. Didn’t have any holes at the very front of the camera in previous version. Can I fix it somehow?
P.S. I use the advanced material pack for landscape.

I think that I fixed the issue. Found the Max Displacement controller in the details tab of the material and set it to 100. Also turned on the Crack free Displacement just in case.