Why if we use replace object on town center wont progress?

I have used an effect in a trigger named replace object and replaced towncenter of player with player2 now player 2 have two town centers in dark age. And now player2 advances to feudal age. Only the first town center changes into feudal age but the replaced object(second tc) remains in dark age. I dont whether its just the skin or all the abilities stay in dark age.

and the treaty line of the second town center still belong to red :smiley:

What to do guys? Please help me out

From my experience it’s just a skin.

Not true converted units and buildings are locked in place and can not receive additional upgrades like fIetching, masonry, or age-up upgrades which in this case is +1/1 per age.

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So, is there any solution to work out with the conversion that can also convert treaty line?