When a creaking is targeting the player and both of them are in water, the creaking will swim trying reach the player, which is expected.

However, when the player looks at the creaking and the mob completely submerges when staying still, after looking away again the creaking pathfinding will break, making it swim to a random direction to get out of water, even if it despawns.

How to reproduce

1. Spawn a creaking near a river.
2. Trigger the creaking and run into the river.
3. Notice how it follows you in water.
4. Look at the creaking until it submerges completely.
5. Look away from it again.

Expected result
The creaking will reach the player normally while swimming.

Observed result
After being submerged, the creaking pathfinding breaks and goes into a random direction instead of reaching the player.