It’s hard to recreate this bug but what happens is that the military tab stuff no longer pops up.
How I encountered it: I wanted to add a citizen to a party. I think I might have triple clicked, exited hastily or something but something where I wanted to add a member to a party and disband the party.
Defend - no icon on top. Citizens will be on the defense though.
Attack - Create party shows up. Can no longer create a party though.