I no longer have my credentials for my Microsoft account, so I am unable to post in forums, however, I have noticed a bug with Town Centers.
If you start constructing them in the Feudal Age and progress to the Castle Age, the Town Center will be completed in a damaged state.
It appears to be proportional to the amount of progress made while advancing to the Castle Age.
For example, I had a Town Center that only had 800 HP left when it was completed in the Castle Age, and it was on fire.
Interestingly, if you build the Town Center to around 60%, it will automatically finish when reaching the Castle Age.
This can be easily tested in the Map Editor.