Axolotl named via anvil loses name when released

To Duplicate:
->Place Bucket of Axolotl on anvil
->Rename Bucket of Axolotl
->Empty Bucket of Axolotl into the world

Expected Result:
Axolotl retains name given on anvil, shown above its head

Actual Result:
Axolotl is unnamed, and reverts to Bucket of Axolotl when picked back up