Semi Broken LOD generation in imported chunks.
After pasting some chunks from an old world (using MCA Selector) into my server those pasted chunks look like this when seen through distant horizons. As you can see none of the original chunks have any issues (they are the higher terrain in the top left). I even completely deleted the data.sqlite file from the server and the distant_horizions_server_data folder from the client. However, neither of those seemed to have any effect. If anyone could tell me what I am doing wrong here It would be greatly appreciated. I will happily provide any data you may need.

Solution
Well, I found a solution. I selected the whole broken area with WorldEdit, ran //set grass_block, then //undo.