Really odd to insist that the Mercenaries not updating species traits is "working as designed" considering that's the population they draw from and the previous version of the population literally does not exist anymore. Guess they are making their own society within those stations.
But yeah, to paraphrase Nick Fury, I recognize that the devs have made a design choice, but given that it is not a very sensible design choice, I've elected to keep considering it an unresolved bug.
Edit: I've also noticed that my enclave made with the latest version of my species seems to have admirals while leased while the others don't, so it might quite objectively be a bug. Could have been a coincidence so I don't want to sound too sure.