i spawned guardians in lava and they did not die then i hit them onto ground and they did not die (ground = dry land)
spawn a guardian in lava
Spawn a guardian on land
Environment
Minecraft 14w25a Mac Osx 10.9.2 java- Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-462, mixed mode)
fixed in 14w26a