In the newest snapshot (14w28a) I attempted to name a killer rabbit to get it to show the "The Killer Rabbit of Caerbannog" name tag and it instead used the temporary name I had chosen (Caerbannog) and displayed that name instead. When I saved and exited the game and reopened the world using snapshot 14w27b the naming appeared correctly as "The Killer Rabbit of Caerbannog". When I returned to snapshot 14w28a the name was once again "Caerbannog" as I had created in the nametag.
I did the entire process again with the name "Killer Rabbit 1" with the same results.
In the newest snapshot (14w28a) I attempted to name a killer rabbit to get it to show the "The Killer Rabbit of Caerbannog" name tag and it instead used the temporary name I had chosen (Caerbannog) and displayed that name instead. When I saved and exited the game and reopened the world using snapshot 14w27b the naming appeared correctly as "The Killer Rabbit of Caerbannog". When I returned to snapshot 14w28a the name was once again "Caerbannog" as I had created in the nametag.
I did the entire process again with the name "Killer Rabbit 1" with the same results.