Should returning be overridden at all?

[Zeldor]

Another thing is getting Returning override normal spell, I had my Couatl cast Vortex of Returning instead of Astral Healing after my army annihilated small enemy suicide squad.

[WraithLord]

A related question, does returning work if home province is protected by domes?

My KB says returning should work (sec. 6.14.5). It refers to dom-II so my question is whether or not this was changed in dom-III.