Sorry to bump this because it's kind of old, but I did find out that I was doing something wrong.

In case anyone comes here for the same issue, the "Reinfuse Previous Atmas" does NOT save them when you choose from recent history.

I now have all three of the atmas I wanted in my "previous set" saved there.

Thank you, and I apologize for using up dev time for an issue that wasn't really a bug. =)