Character is a level 80 elementalist using a trident. I have found that in about 20% of encounters the #1 autoattack skill fails to do any damage, regardless of attunement.
In the screens below, I show such an encounter in earth attunement. No damage is being done by the #1 skill and no bleeding is being applied to the target. The #2 skill is then used, doing damage and applying bleeding, but the #1 skill still fails to work.
