tp command block with clock crashes entire game even after deleting world

Put the summary of the bug you're having here
tp command block with clock crashes entire game even after deleting world
What I expected to happen was...:
Describe what you thought should happen here
that I delete the world and it would not affect my other worlds and entire game
What actually happened was...:
Describe what happened here
that my world crashed, slowed down my other worlds if it was possible to go on them which was rare, and even after deleting all my worlds, it continued forcing me to delete the whole game
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here make a clock
2. ...attach to a command block set to tp u far away
3. ...start the clock