Leigh

So far, my named dolphins have not despawned on this build. Unnamed dolphins, fish, and squid do despawn, but I assume they are all meant to. Named dolphins are now remaining, including trips to the nether, but I have only done a little bit of testing.

Ah! Glad it wasn't something I was doing wrong! I was so frustrated with dolphins (both named and unnamed) being the only thing to keep disappearing out of my "zoo" no matter how hard I tried. I also was doing all I could to make sure they stayed alive, weren't escaping, weren't drowning, had played with items, etc. but they would still disappear after I left the immediate area.

Thank you for posting this!! I hope it gets fixed soon.

Actually nevermind, think it was the new optifine alpha thing. i installed that last night and it wasnt doing this last night so i didnt think that was it

i have, its vanilla in the screenshots and removed the texture packs from the minecraft folder