After creating a ticking area, it cannot be removed until the tick after.
Run a commandblock chain containing the following two commands:
tickingarea add ~ ~ ~ ~ ~ ~ RemoveMe
tickingarea remove RemoveMe
The second command block will fail and say that "No ticking areas named RemoveMe exist in the current dimension". A similar message occurs when using coordinates to remove a ticking area.
Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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