The Bug:
Right-clicking on tamed nautiluses or zombie nautiluses that don't have saddles opens the nautiluses' inventory instead of allowing you to mount them.
Steps to Reproduce:
Summon a nautilus and tame it.
Hold nothing in your hand and right-click on the nautilus.
Observed Behavior:
The nautilus’s inventory is opened and you don’t begin riding the nautilus.
Expected Behavior:
The nautilus’s inventory would not be opened, and instead, you would begin riding the nautilus.
this maybe deliberate, like the smooth shell of a nautilus in water,making it impossible for you to ride