I'm not sure if this is a bug or working as intended. I started a game as Osman and started whacking my neighbors, taking cores, and finishing missions. (Osman died in battle kind of early, but oh well).

Suddenly and without explanation I lost the "Rise of the Ottomans" nation trait. There was no explanation for why that happened, and it's kind of an important trait. Is this working as intended or did something weird happen?