The Parallax version of Assorted Mesh Fixes causes this. If you have it replace the
treepineforestbroken06_09e933e6_trunk.nif
mesh that comes with it with the one from the non-parallax version.
There is a broken lod when rebuilding the tower outside the castle gate with Volkihar Rebuilt but only when I use dyndolod with it:
https://imgur.com/a/report-a2y1naB