only vanila and CUP. 2D texture. everything was fine before
Looks perfectly fine here. The problem is on your side. It looks like LODs are not correctly loaded, which usually means your memory is low. Check that your system drive has enough swap space.
If I had a version of the CUP Core version so 1.10. I would show you the difference.
If you open the Chernorus and Chernorus summer map there, the quality of the trees and the detailing are colossally different. Now models of Chernorus trees have just been installed from Chernorus Summer
There is a difference? Of course have. Previously, the quality was much higher than now
You have already reproduced the problem!
Do you have a model in version 1.0 and 1.12 differ in the quality of drawing at long distances. Either you are blind or you do not want to accept this fact.