Monster Spawners and Chests Destroyed by Sand

Every dungeon i find in the desert is destroyed by the sand that falls. leaving scattered items. Note: I did make a custom world with the Dungeons set at 100. I have found 3 like this. I will take a screenshot of the next i find. Also, i could not find any duplicates when using the search term "Dungeon". there will similar problems but not affected by sand in the desert