[Shaman] Earth Elemental spawned from Totem isn't healable

You can heal the Fire Elemtanl, but the Earth One isn't healable. When trying to direct healing it, there is an error message and heal is never cast. When using Chain Heal jumps, it shows an "Immune".

Either he should be healed or the Fire Elemental shouldn't. Maybe the issue comes from heals to be Nature and he has some form of immunity preventing him from being healed ?