Bug - Third Dracula Campaign

At a certain time , Darstor (grey) start to build a wonder , but there is no warning about it , and even if the wonder is completed (I destroyed it before got finished) , I don’t think it will trigger the Wonder Victory .
I don’t know if is it a AI build order error or a mission feature , but still needs to be fix it .

I think, that this wonder is built just for the eye candy. I enjoyed destroying it. It might be a bad idea to start wonder victory countdown when it is built, because might make scenario too hard.

So I think, that this is a feature for the fun and not a bug.