@Felizon89
I also noticed a related issue when switching from the Random Map game mode to Co-Op Campaign, and then back to Random Map. Internally, although the slots are pre-populated with Scenario AI Parties (as indicated by the API), their Color, Civ, and Team details are not displayed. Additionally, the Civilisation Set dropdown menu becomes unavailable
Below is a screenshot captured after switching to the Tours Co-Op Campaign and then returning to Random Map, along with the corresponding AI readout indicating that the slots have been populated:
