In a world with creative and cheats enabled, the host of the local server can loose their permissions and ability to change themselves back to operator status. This can be easily accomplished by changing yourself to adventure mode and deopping yourself. After that, you won't be able to use commands to return to creative or change your player status through settings. This is easily exploitable in a world with xbox live friends. People could troll the owner of a world and make their own game much harder for themselves.
I have a video showing the problem. But since the file size is rather large, I have pasted the link here instead: https://youtu.be/IcZ_0zshnVo
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I have experienced this bug in version 1.16.1 (bedrock edition).
Steps to reproduce:
Create a new single player world with cheats enabled
Have a second player join the game
Give the second player op
Have the second player deop the host
At this point the host will be unable to run most commands. This can be rectified by asking the second player to give the host op again.
Please do not mark unreleased versions as affected.
You don't have access to them yet.