I noticed that a map i was carrying in my inventory was blank when it didn't used to be. I went back to where i store my maps, and the one in my inventory seems to be a duplicate. The one in my inventory was map number 590. But there is another map 590 in the chest now, and the one in my inventory has a new number but is blank. When i take out the 590 in the chest and try to use it, it becomes blank and is given a new number. I can create a new map and it works fine. Is it possible that because i've duplicated these maps with the shulker box trick that they are now bugging out?