Version:1.8.2 build 4

Issue: during creation if one entity creates a jockey say spider and it's a jockey spawner it will spawn two skeletons instead of one when it has a passenger tag. If it doesn't allow jockey spawners from one ent otherwise deny it. recommended to fix ghost entities first so I know how to apply this without re-causing the bug

I think this should be an nbttag option on both spawner and item but, not a bug.