invisible shulker box that crashes the world when you break them

So I have some invisible shulker boxes that crashes the game and the realm when you break them.
Coords of the shulker boxes :

675,64,7

674,64,7

Link to the world download :

https://drive.google.com/open?id=1d-m1r4NYiykCZ-avXwzL7Y-0GvSViqDI