Can confirm this is still happening.
Did a 50m Survival on Fenton's Field - Pluto with 2 friends, had my Necramech, Archgun and Primary weapon levelled to Max, upon returning to Dry Dock they were only rank 23, 23, 27 respectively, same happened to my buddy who was the squad leader for the session.
Worth noting was that it took nearly a minute for the game to process our map vote.