This looks to be a victim of a decision I made to make Zone wars occur in the Exoglobalization era, rather than a later era where this could also be a social trend.
Please replace the first sentence of the Social Impacts section under Zone War with the following: "When a dash-underlined social trend is rolled while the Zone War mission control trend is in effect, this indicates the start of a hot zone war -- replace the social trend rolled with the Zone War social trend."
Thanks for picking this up.