Fully upgrade your Hideout work around?

I have a Zana hideout, my zana is level 6, so I don't have a fully upgraded hideout.
While talking to Elreon. who is level 7, I accidentally click "create a hideout", and gained the "Fully upgrade your hideout" achievement immediately upon entering the "Preview Hideout" zone.

I then cancelled and went back to my Zana hideout and I still had the challenge completed.

Obviously, its nice to get the challenge, but it smells like a bug to me.