In Season of Discovery as a Warlock with the Master Demonologist talent and the 5 pieces of the ZG set (which increases your Master Demonologist buffs by 50%), whenever you enter or exit an instance with a pet summoned, the Master Demonologist buffs disappear and you have to resummon your pet or relog.
To replicate:
- Equip all 5 pieces of the ZG set
- Have the Master Demonologist talent
- Summon any demon (Fel Hunter for example to see the +All Resistance go away)
- Note that you have the Master Demonologist buff
- Step into an instance portal
- You should no longer have the Master Demonologist buff