Connestion lost with server on joining. This didn't happen immidiately but a few minutes later when i tried to explore already created land with a lot of passive mobs in it.
The server map was created in version 15w41a
Error does not happen in singleplayer
Reverting server to old snapshot, renders all animals invisible. This will not fix with an old backup of the map. Only a new server folder where the map and server.jar is copied over, is the invisibility fixed.
Same issue, this world was created with 15w34a multiplayer server, the error happens with worlds created with earlier versions as well.
After about 10 to 40 seconds, I am disconnected with error "image included."