I tried to change world sizes in world generator config, and the map is generated successfully with a custom map size far greater than the maximum default setting (Huge 120x80). However, after I capture any Urkan, the game crashes at end turn 

(log file write: 

 Timeout! The AI scheduler is taking too long allowing for the turn to end... aborting!

22:38:48:258 STACKTimeout: Tickables NeedTick: AICommanderMission_RoamingDefault, , , , , , , , AICommanderMission_RoamingDefault, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , AICommanderMission_RoamingDefault, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , AICommanderMission_RegroupArmyAt, AICommanderMission_PacifyVillage, , AICommanderMission_Pacification, , , , , , , , , , , , , , , , , , , , , AICommanderMission_AttackAndTameKaijuDefault, , , AICommanderMission_PacifyVillage, AICommanderMission_RegroupArmyAt, , , AICommanderMission_RegroupArmyAt, , , , , AICommanderMission_RegroupArmyAt, , , , , , , , , , , , , , , , , , , , , , AICommanderMission_RegroupArmyAt, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , AICommanderMission_DefenseRoaming

22:38:48:258 STACKTimeout: Tickables NeedTick Count: 13)

I've tested many factors, and whenever I return to the normal default map sizes, the error does not happen. This crash will happen whether I change the map size config in one of the default setting used (Ex: Huge 180x120 instead of 120x80), or add an entirely new map size setting. 
Though I've not found anything in Public that shows Urkans' behaviors critically dependent on specific map size settings (not related to the wat they spawn into world, I think, as they spawned just fine, and the game only crashed as I capture or tame one of them), is there any such relationship? And does anyone know what changes I should make to add larger map sizes config without errors with Urkans or in general?