Around my underwater base that I am building, I have dolphins attached to fence with enough movement space to reach the surface of the ocean. However, if there is an item in the water near a dolphin, it will drown because it would rather try getting the item (despite not reaching it) than move to the surface for air. I've had to completely rinse seagrass and kelp around my pillars just to make sure they don't drop for whatever reason.

(All dolphins are named and do not despawn without reason, and I'm sure this is the reason why they sometimes vanish)

I have attached screenshots showing this process, and I felt very bad while doing this experiment. I'm sorry about torturing a dolphin for the sake of this.

Reproduce

• Build a tank of water with no roof
• Put a glass floor in the middle of the tank (so there is water on both sides of the glass floor
• Summon a dolphin on the top part of the tank so it can access the air
• Drop an item below the middle glass floor
• Wait
  Notice the dolphin tries to reach the item but fails and eventually drowns

Expected Result

The dolphin would go up for air and not try to get the item