Adding Walls to Mongols(help)

As part of my BluGold’s Seige Warfare mod I want to add palisade walls to the mongols to give them a fighting chance against the other empires increased wall abailities, put since I came back to the game the gates seem to have been updated, I’m struggling to fix my gates to my mongol palisade walls any help would be appreaciated

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I can still build normal walls but can’t get the gates to attach anymore