Left clicking/interacting on a tamed nautilus without a saddle opens the player inventory

When you’re left clicking/interacting on a tamed nautilus without a saddle, the player inventory opens for you.

Steps to Reproduce:
1. Spawn a Nautilus (preferably underwater)
2. Tame it with a pufferfish
3. Left-click it

Observed Behaviour:
It opens the player inventory.

Expected Behaviour:
Nothing happens.