When closing off parts of water with waterlogged iron bars, fish still try to swim through. They then get their hitboxes stuck inside the iron bars and are unable to swim out of the block.

What I expected to happen was...:
Fish swimming away from iron bars.

What actually happened was...:
Fish getting stuck in iron bars.

Steps to Reproduce:
1. Make a body of water.
2. Close part of it off with iron bars. For example, like a wall in a river.
3. Put fish in the water, wait until they pathfind to the other side.