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.
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Missing water, terrain filler, and missing textures.