I thought that command blocks were restricted from the use of the command /op and that it was set as a player only command, but that makes sense. One thing that they could do though is reimplement this feature and just disallow, like you said, the /op command from command blocks.
I don't care if this is a duped issue, can someone please fix this?!
yeah
The only difference is that it will summon the entity, but you can't see it until it touches the ground.
Even if you do this, it won't work, even in the new snapshot