This collection needs the player to gather four different commendations earned for defending each cardinal direction of Tarir (North, South, East and West) against the octovine. I did it for South now and did not get the commendation for that. The meta event in this run was successful and Tarir was defended. So, when it really is a bug, the collection can not be completed right now.
(edited by Fubai.5326)
I can confirm I experienced the same issue. I have the Luminate Backplate collection unlocked after finishing Fallen Masks on Silver. After unlocking it, I defended the South Tarir Octovine, and received no South commendation.
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