Shulker boxes can't be put inside other shulker boxes

I was doing something in creative mode when I suddenly notice no matter how much I wanted to, the game didn't let me put a shulker box inside another shulker box

Steps to reproduce:
1 take a shulker box and place it down
2 open the shulker box and try putting inside another shulker box
3 you will notice that for some reason you can't