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Thr entry, building_slum_creation_time_mod, in the table, effect_bonus_value_basic_junction_tables no longer works, meaning it is no longer possible to adjust slum creation time via effects (or anywhere for that matter, because the building_slum_creation_time entry in campaign_variables is also nonfunctional).
A minor bug for sure, and one that largely effects modders more than anything else, but it's frustrating nonetheless.