It is possible to kick yourself out of a world with /kick

Using /kick can kick yourself out of the world.

To all moderators and helpers: Please don't remove the labels again

How to reproduce:
1. Make a world with cheats on
2. Type /kick (Your username)

What I expected:
The command would say cannot find player (Your username).

What I saw:
It kicked me out of my single player world.

Notes:
Also affects education edition