25 Feb 2022
There is a glitchy map (map_7598) at the coordinates -407.50 104.50 -807.97 (Spirited Away map). It draws and updates that map when you fly around with it in your hand.
Another glitched map is at 3961.97 141.50 -3213.50 (at /warp Howls_Castle, map_9010). The minecraft:armor_stand at 3956.53 140.20 -3228.96 is wearing a player head with a missing texture.
There are possibly many other maps and armorstand playerheads in the world that are like this.