I have run Dyndolod again in an attempt to generate a papyrus0.log that you aksed for. That failed. However, in a new game things are much worse now. The waterwheel (and windmill) is fine but the entire lumbermill in Riverwood is now fading in and out depending on where I stand. I can walk right through it. Looks like an occlusion plane phenomenon. I have uploaded some files you asked for to this link:
https://drive.google.com/drive/folders/1YHmdbX5ULckN2bzaRatMgD8grd0cFeki?usp=sharing
However, I don't think there is a straightforward fix, so I give up. Please feel free to ignore this post. Just wanted to stop by and say thank you for your time and effort.