Some POI's have missing terrain filler, gravel, destroyed stone, and water blocks. I've been using the prefab editor to fix the missing blocks. Maybe I can help in some way. I can provide a list of the prefabs with what side of the prefab the missing blocks should be or maybe I can attach files from the prefab editor that have the blocks I added. Or maybe its already been noticed? Also the support beam blocks that are used on the back of trailer prefabs don't have block textures and are invisible.
Missing water, terrain filler, and missing textures.