I created a small enclosure on land (walls 2 blocks high) filled with one layer of turtle eggs (each turtle egg was stacked to the maximum of 4 eggs). I then spawned a bunch of dolphins on top of the eggs. Because the dolphins are sea creatures and not land creatures, they hop and flop around likely trying to find water, but because they are in my eggy enclosure, they simply crush tons of turtle eggs. Within 3 minutes of the turtle egg massacre beginning, the server crashed and spit out an error, found here: https://paste.md-5.net/loyumetepe.avrasm

Hopefully this is enough information for you to understand the issue (it's my first issue report).