Trying to attack non-attackable Units

This has happened in both the battlegrounder and grinder products. If attack before being attacked is selected, it will try to attack non-combat pets, companions, and friendly units. It also tries to attack hidden world units such as 'World Trigger (lvl 60)' It also seems to try and attack hunter, warlock and shaman pet a lot more than it should.

[Normal] 00:16:41 - Player attack before being attacked by World Trigger (Large AOI, Not Immune PC/NPC) (lvl 60)

[Normal] 00:23:44 - Player attack before being attacked by Lil' Bling (lvl 1)