Affects Version/s: Minecraft 15w43c
Fix Version/s: None
Environment:CentOS 6 (server)
Java version 1.7.0_21 (server)
Client 1: Windows 8 Java version 1.8.0_45
Client 2: Windows 7 Java version 1.8.0_51
Some skeletons, after being repeatedly teleported using a Repeating Command Block, seem to become immune to damage, impossible to move via entity collision, unaffected by gravity, and immune to all types of damage except for player attacks.
They can, however, be killed using the /kill command, but only if a radius is not specified.
The same issue occurs on occasion (thought very rarely) with baby zombies.