Displacement/brush tearing

[pogviuemper]

For whatever reason, some random brushes briefly tear apart at their edges and presumably show a skybox texture; this really hurts to look at

These brushes are perfectly connected with neighbouring brushes, no unsewed holes inside the editor at all

I have no idea what causes this or how to fix this, but from what I observed, it tends to happen with angled/strangely structured geometry

Would really appreciate any help, this is a problem on one of my maps, and I really want to fix it; screenshots below are from cp_egypt that have exactly the same issue