Ascension Chest

I went in to the summons gate to get a free daily summons and a ascension chest popped up before I could do anything else. Now I haven’t done anywhere near 10 Atlantis summons. So do they give you partial credit when the Atlantis gate closes? Is it a bug? I had heard from someone in beta that the number of summons credit for chests carries across months, but I like this better ;-).

BTW - only trap tool and dragon bones…but still a nice surprise.