Ticking areas from the Nether still have effects when all players are in the Overworld, even though they don't appear in /tickingarea list unless all-dimensions is set.

Steps to Reproduce

1. Place an always-active repeating command block in the Nether with a command like /execute @a ~ ~ ~ fill ~-4 1 ~-4 ~4 127 ~4 water 0 replace air
2. Set a ticking area up in the Nether with the command block inside.
3. Go back to the Overworld.

Expected Result

The command block deactivates as soon as the player leaves the Nether.

Observed Result

The command block remains active even in the Overworld and the End. (Thank rqbby for testing the End!)