Issue Description:

Pack: FTB Beyond 1.11.0 (what was here is rather unhelpful, so I replaced it).

What happens:

Powered spawners are spawning skeletons inside of the spawner block itself. They will continue to do this forever, to the point that there are thousands of them and the game lags to the point of being unplayable (and if left long enough, the entire server will become lagged out). They cannot be interacted with, killed by command, killed by peaceful mode. or anything else. The ONLY way I have found to remove them is a complete server restart

What you expected to happen:

This to not happen

Steps to reproduce:

1. Place a powered spawner with a hostile mob type (doesn't have to be skeleton/wither skeleton)
2. let it run for a bit

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Affected Versions (Do not use "latest"):

• EnderIO: EnderIO-1.10.2-3.1.183
• EnderCore: EnderCore-1.10.2-0.4.1.66-beta (this is what came with the pack, and for the sake of it being playable by my friends, I am not doing anything beyond pack updates).
• Minecraft: 1.10.2
• Forge: 2316

Your most recent log file where the issue was present:

Nothing is logged, however I do have a screenshot: https://www.dropbox.com/s/vw03j7uo1k9spil/Screenshot000598.png?dl=0