This seems to be a severe issue with the game “engine” coding rather than a small issue that needs to be resolved prior to full release !
While in Tank spec with Gurthalak in my BAGS (since you cant use a 2h and shield) it keeps activating the Tentacles of old buff from the weapon while as stated above its in my bag ! , if this happens for Gurthalak what other weapon proc´s are affected ? , can you have Legendary caster staff in bag and get double proc´s anyway ?
Evidence of the proc´s can be seen on the fights where i tank (morchok / ultraxion / warship / spine / madness) , cant put link to logs on here but easily found on warcraft logs