1. You need two players in the world
2. player one stands on the shulker box that is facing up
3. Player one opens the shulker box causing him to fall into the shulker box
4. This action will cause player two’s game to crash but not player ones

This was repeated multiple times on a private multiplayer world with the same result each time. If player two is the host of the game player one will also undoubtedly crash aswell.