If the player is being followed by a creaking spawned from a creaking heart, the mob will despawn after the world is reloaded. This can be exploited in singleplayer worlds to despawn any creaking that is following the player at a risky situation. Summoned creakings aren't affected.

How to reproduce

1. Spawn a creaking with a creaking heart.
2. Let it follow you a few blocks away from the heart.
3. Save and quit, then reenter the world.

Expected result
The creaking would stay at the same position it was before the world was reloaded.

Observed result
The creaking despawns after world reload, then reespawns in another position if close enough to the heart.