Leader fish loses AI when player is outside of the water

Problem: The leader fish in schools will lose it's AI when the player is not in the water itself, however jumping in the water itself will cause it to move again for a short time but stop again once you exit making all of the fish crowd into one corner.

Steps to reproduce this issue: 

• Make a fish tank of any size.

• Spawn mutiple fish of the same type (tropical fish)

• Top off the tank so that you can't enter anymore

• see the leading fish do absolutely nothing while all the other fish push it into the corner