Question Image turning black in specifiy locations after importing textures from a Terrain

See Video Footage.

https://www.dropbox.com/sh/2l7jd106lgw7vti/AACI5ybaCOgyRiLr9lttADdNa?dl=0

After importing a Terrain, the Textures and the Texturelayers from a URP into a HDRP Project i am always getting weird Blackscreens.

It seems like the Textures of the Terrain in combination with this Terrain is the cause of the Problem. When the Screen turns black there are Black Dots on my Terrain that seem to cause an error.

• If i remove the Terrain and apply the Textures to a different new Terrain everything works.
• Moving and turning the Camera away from the Terrain works
• Lowering the "Base Map Distance" on the Terrain fixes it temporarly
• Only Solution that works for me longer is putting the total number of textures down to 8 or lower.

I found that this issue in a different approach is known but it is marked as "fixed".
https://forum.unity.com/threads/hdrp-models-turns-screen-black.724700/
I am in Unity 2020.2.6f1 with HDRP 10.3.2


Thank you in Advance!