MoP - Trinkets

Ehm, Don't know if this is the right place but can someone tell me the following:
Ony my rogue I got bad juju (That trinket that spawns gnomes and makes u kill everything), now in world pvp, PvE & Battlegrounds it works and procs and stuff...in arena's it does not? Is that supposed to be like that? or is it bugged? Cause I've not seen my little gnome buddies for ages in arena now :(

You can't use pve trinkets in arenas. Gnomes (and other stuff) should not appear in arenas and this is not a bug