Floating Shulkers (Mob)

Hello, this is my first time reporting a bug. This is a single player world I've had since 1.17, updated to 1.19, and now 1.20. When flying in the End to find new End cities to search for the new item trim, I encountered some floating shulker mobs that were near the city buildings, but floating in the air (not attached to any block). I tried to shoot one with my bow, but the arrows went through it as if it was not there. These floating shulkers appeared in at at least 2 different End cities and I took some screenshots (included).