If you have an ad chest visible, and go to the Island Editor mode, you can't place buildings where the chest is, making you have to either cancel your editing to go clear the chest, or finish it with a building out of place, clear the chest, and then put the building where it belongs. Can you change it to hide the chest while editing island, and then replace it somewhere else after saving the base? It makes editing hard when it happens to appear somewhere near the center of the map.