Disappearing structures

[barech]

I have come across a weird situation or maybe I never noticed it before. I conquer a territory and the horsebreeder or trading post gets distroyed or similar low level building. But when I go to the build screen it does not appear until I build a bigger fort. And I already have a Keep or a Castle. Does anyonelse have this problem? or is this normal? bug?

[Cooperman]

A horse farmer needs 20% farming in that province before you can build it, was that destroyed as well?

[Odyssey of War]

When a territory is conquered, buildings are destroyed as casualties of the battles that were fought in the province and due to armies destroying as much as they can before they finally retreat. This is a feature of the game.

The game always requires the following of the tech tree, even if higher level buildings are built, you must have the lower level ones to get any other bonuses or units from the higher level buildings.

[barech]

I know that buildings get destroyed. I am not totally sure of which structures exactly were destroyed. But I do remember that the 20% was not on the build screen nor was it on the already built. I guess when I notice it again I will print the screen and post it here so that you can see it. Probably I was missing something and I did not realize it.