If i m not mistaken Mongol culture cannot attach outpost.

I don't think it's a bug. The mongol outpost cannot be attached to cities.

Akaelnyl wrote:

I don't think it's a bug. The mongol outpost cannot be attached to cities.

Really?! Why is that? Where does it say Mongols can't attach outposts?

Ok. 

I see from the HUMANKIND wiki that the Orda (emblematic Mongol infrastructure) cannot be attached to cities -> Orda

I don't think I might have chosen The Mongols in that case TBH.

SeekTruthFromFacts wrote:
I agree this should be noted in the Culture selection screen (maybe when you hover over the Emblematic Quarter), because it significantly affects the choice of culture.

If i'm not mistaken it is displayed there. But in general this is just a bad design. The possibility to connect outposts to a city is a necessary basic mechanic in the game and should not be disabled in my opinion. As the mongols you can't get a single expansion star this way, because only connected terretories count.

I'm not sure, it kind of simulates the nomadic conquest well for Huns/Mongols? Their unit is quite good even after the nerfs and their horde keeps growing, but the offset is that your creation is prone to falling apart.