Traitstones on glory/gem chest tabs

Minor graphical quibble. When I look at the tabs for glory and gem chests, there is a list of things I could receive from opening one.

The bottom entry in both tabs is a legendary troop (Hydra, specifically), with an arcane traitstone in front of it (Beast, specifically). Shouldn’t that be a Celestial traitstone, since we’re talking about legendary troops?