As you can see, I can't place down Mooshroom spawn eggs, I heard from another player that he can't either. So what's the point in having spawn eggs if you can't place them down.
Just tested this. Seems Mooshrooms & Blazes aren't working, but I'm getting positive off of Silverfish. I'll continue experimenting and notify administration once I figure out which ones work and which ones don't Edit: from my experiments, I see that Silverfish and Nether mobs are the only functional ones. Now that I got my conclusion, I'll be notifying the administration, and locking this.