if this is a test city of some mod i doubt this can be considered as a bug, there is nothing to fix here, unless its regular player who found a way to get not available buildings somehow
After checking the fellowship, I mentioned that ALL members have this buildings. It looks that a developer tested this on Beta.
If this is true, it would be fine if this is described in the fellowship name
Awww ... wouldn't that be a great idea to showcase the new building each day so that players could admire them ingame with animation instead of that tiny preview in the event window ? I'd love that ...