Pointers to scene objects in GameMode

So I’ve added this bunch of properties to my GameMode class

    UPROPERTY(EditAnywhere, Category = "Towers")
	class ATower* playerTower;

	UPROPERTY(EditAnywhere, Category = "Towers")
	class ATower* enemyTower;

	UPROPERTY(EditAnywhere, Category = "Towers")
	class ASupportTower* leftTower;

	UPROPERTY(EditAnywhere, Category = "Towers")
	class ASupportTower* rightTower;

Made GameMode blueprint, set this GameMode in World Settings, and tring to set values to properties. But everytime I chose anything it drops back to “None”.

How do I set those properties in blueprint?