Sea turtles, when swimming, are able to shove their head into full blocks. Then, even when lured with sea grass, they seem to be unable to be “un-stuck” until the block(s) that their head is stuck in is broken. This could occur both when the turtle is swimming and have no blocks underneath, and at the bottom of the ocean with blocks underneath them. Some blocks their head is stuck in: Granite, stone, sandstone, etc.

I was only able to observe this bug when the turtles are fully submerged in water.

Steps to replicate:

1. Find turtles
2. place solid blocks around them

As they try to pathfind, they may get their head stuck into one of these blocks.

Also: I am unable to provide an image right now but will do immediately when possible.