Earth elemental cannot attack Falstad and Azurous

On the other hand, other flying bosses such as Rend or Gish can be attacked by Earth elemental while they are flying.

Are Falstad and Azurous flying too high?

No melee can attack them

I have noticed that too, for some reason in PvE, my Earth Elemental can punch a mounted Rend

I know. I think this is a similar bug to the Abomination hooking bears (Mountaineer’s) and skeletons (Necromancer’s).