Even when standing at the same position, rotating the camera triggers popping.
You could try using Forced LOD to see if it’s specific LOD issue. Then LOD Bias and LOD Distribution could help. But I think it might be terrain bug with normals or sth which would require bug report on Issues · FlaxEngine/FlaxEngine · GitHub ideally with that terrain zipped in (without material, just project with that terrain alone).
The cause is that the LOD of chunks adjacent to the current chunk changes, resulting in boundary deformation. The deformed region can span half a chunk.
I implemented a script that locks the LOD levels for the eight adjacent chunks, eliminating the popping artifact.
lock 8 adjacent chunk’s lod