For instance - titan skills "falling rock" and "lava piercer" are excluded from the auto-combat rotation. If you only equip these skills and nothing else - your character just sits there autoattacking and will not use the equipped skills.

Similarly void knight "dark mist" skill is also excluded from the auto combat rotation.

I am sure there are other classes with similar skill issues - but these are the two I have noticed and tested repetitively as I frequently play both the mentioned classes

Is this exclusion from auto-combat intentional? Or is this a serious bug?