Summary: I used /kill @e command at Y=130 or so and i saw in the chat [killed Glow Squid, Glow Squid] which were naturally spawned.

How To Reproduce:-

1:- Enter a world with Caves & Cliffs Experimental Feature On.

2:- Find a Naturally Spawned Glow Squid.

3:- After finding, fly 200 or 300 blocks up.

4:- After flying, use the /kill command and observe the chat. 

Observed Results:

When /kill command is used, the glow squid gets killed, even tho the player is 200 to 300 blocks up.

Expected Results:

Glow squid should despawn like other naturally spawning mobs.