I don't know if is similar but I been trying to fix some disappearing shadows (only when I move they disappear) might be a rendering problem. Also have in mind that Saves can get Corrupted, maybe try a fresh New Game.
The only other posts I saw are about Oldrim and are very different bugs. What I found useful for others bug fixes is just manually order your plugins, LOOT sometimes doesn't know where to put plugins, I had WICO plugins almost on top and that made some NPCs faces grey/dark (fixed leaving WICO plugins on bottom before Batch Patch)