Generally this issue shows up when your mesh normals are very extreme. Basically, the resolution of your texture isn't high enough to accurately represent the gradients needed to compensate for the smoothing. If you up the texture res you should notice this getting better. Generally what helps in these cases is to use hard…
Thanks, did you correct, I read about this tutorial, but there is a handy toolkit for asser, repairs on other bugs, cooked in 2048 anti-x4, the model has no mirrored textures
The problem here is that you've added hard edges where you do not have UV seams, which will cause these errors (also covered in the tutorial I linked earlier). Wherever you have a hard edge you need to break the UVs.