In the 1.0 beta (0.17) if you go into creative and get any spawn egg then move to survival when you spawn the mob the egg doesnt dissapear
MCPE-18188
Spawn Egg Spawns Mob But Doesn't Use Up An Egg
Resolved
Fixed
1
(Unassigned)
Unconfirmed
Tablet - Android - Amazon Kindle Fire
Fire Os 5.3.1.0
0.17.0.1
1.0.0.2
Retrieved
Fixed in v1.0.0.0