Finally discovered the joys of FFA a few days ago, and got through placement matches last night.
Four 1st place, three 2nd place, a third place, and two DNFs thanks to getting connection dropped (on my 100MB ethernet… yeah). In the games I won there were diamond players.
Fast forward to the season rank screen, which reads DIAMOND 3 COMPETITIVE SKILL RANK in big old letters… but shows a Platinum 3 icon. Which my profile seems to agree with.
Something is amiss. Even if Plat is the correct rank (I really have no idea), that’s a bug.