Why does no one care about this?

This is a very serious bug! If or when an operator that is not the owner of the world de-ops the owner, they can change themselves back into an operator. but if they are put into adventure with no way out, they cannot do anything with commands, not even change gamemodes. Even exiting the world and editing your gamemode can't do anything.

This allows corrupt or mean operators to actually gatekeep op from the owner of the world, or if done by accident, this can result in basically losing the world!

Steps to reproduce:

• Enter a new world in Creative.
• First set your gamemode into adventure mode, then de-op yourself.
• notice how you are not able to change into op, and have no commands.

What should happen:
Owners of the world should be able to change back into op.

NOTE: Do NOT do this on a world that you love.