in minecraft 1.9 snapshots when you use command blocks to spawn a mob with armor or attributes it spawns a normal mob without anything.
so we can't use anything of the snapshots in mobs.......
MC-88564
Mob spawn incorrectly with command blocks (snapshots)
Resolved
Duplicate
0
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-85544. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.e