Issue Description:

I'm playing Survival (with cheats enabled) using Curse Forge for Mac with Forge version 12.18.1.2053 and EnderIO-1.10.2-3.0.1.96_beta.jar
I found a Blaze spawner and converted it to a Wither Skeleton spawner, then combined the spawner with a powered spawner in an anvil. I excavated a room 11x11x7 and ran conduit down so the spawner is 3 blocks off the ground, giving a 1 block clearance all the way around to account for the spawner's range.
When I turn the spawner on, it charges and attempts to spawn. For a split second i can see the Wither Skeletons appear, then they instantly evaporate as though killed, but they don't drop anything, nor can they attack or be hit. I have also tried a Blaze spawner with the same results. These are legitimately obtained spawners, etc.

Steps to reproduce:

1. Obtain any spawner
2. Collect mob in Soul Vial
3. Combine Soul (wither skeleton) & Broken spawner
4. Combine new spawner (wither skeleton) and powered spawner in anvil
5. Power up new powered spawner (wither skeleton)
6. Watch as spawned wither skeletons go POOF!
   ...

Affected Versions (Do not use "latest"):

• EnderIO: 1.10.2-3.0.1.96_beta.jar
• EnderCore: 1.10.2-0.4.1.51-beta.jar
• Minecraft: 1.10.2
• Forge: 12.18.1.2053

Your most recent log file where the issue was present:

[pastebin/gist/etc link here]

Are you in peaceful mode?

No, i wasn't. But I found that it was in "easy" mode. I guess I have my son to thank for that! I switched it back over to "Normal" and it immediately began spawning normally. Appreciate the input!