Make mountain statics double-sided so sun doesn't shine through them at extreme angles.
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wSkeever
USSEP (https://www.nexusmods.com/skyrimspecialedition/mods/266) - Unofficial Patch Project Team - Please see readme in the USSEP download. This list is rather extensive and ever changing.
Description If you use Enhanced Shadows, you might see shine through mountain statics. I just batch set all mountain meshes to be double-sided so they block such sunlight.
This only takes care of the statics in the loaded cell. Dyndolod Alpha or DVLaSS Skyrim Underside take care of the landscapes and LODs set TerrainUnderside=1 and DoubleSidedTextureMask=mountain,mtn in your DynDOLOD_TES5.ini. Read Dyndolod documentation for details. These meshes essentially does Dyndolod's DoubleSidedTextureMask, but for loaded statics instead of LODs. If you use either of those 2, this mod might not be necessary for you at all.
Similar fix for solitude structures can be found in Assorted Mesh Fixes. I put the mountain changes here because big and popular mountain mods might overwrite the same meshes, and I don't want to deal with that on the other mod.
FAQ
Q: Why? A: Why not?
Q: Conflicts with mod xyz? A: Pick and choose whatever nif you want to overwrite.
Q: Landscapes don't cast shadows A: Use Dyndolod alpha and set TerrainUnderside=1 and DoubleSidedTextureMask=mountain,mtn in your DynDOLOD_TES5.ini
Q: I see another static that needs fixed A: Let me know in the comments, and I'll address it.