"Mastery" title not showing up in Matchmaking

The new “Mastery” title that replaces your previous one at 130 only shows up in Forge and Customs lobbies for me.

Same, when I’m in a Matchmaking lobby I have no title.

I’m positive Mastery as a title is only displayed when you’re NOT in a Matchmaking mode like Custom Games, Campaign, and local (and with friends over Xbox Live) Spartan Ops.

Mine does not show either. I thought it was normal since I saw someone else in MM without it too.