Mob behavioral glitches

• Enderman have no sounds and are completely mute (Tested only in CREATIVE MODE)
• Silverfish spawned in CREATIVE MODE on smooth stone block sometimes de-spawn within a few seconds (Place 4 blocks of stone making a square and spawn a silverfish on each of the 4 blocks) This has NOT been tested with any other block.
• Silverfish sometimes hesitate to move around as if they are STUCK especially when they are first spawned.