Shandan Horse Farm claims it will provide +1 Food/Production/Gold to all Horse resources worked by the city. However, that does not happen.

SQL tries to use _Building_ImprovedResourceYieldChanges table for this, which is not created by this mod - there is an error in the DB log. I changed it to use Building_ImprovedResourceYieldChanges (no underscore prefix) like in your other mods, and added a statement to create the table (this mod was loading before others that do, so there was still an error without that), but it still has no effect. Does that table only function with your core mod installed? I notice that this mod's description does not mention this effect, in which case it should probably be updated so the wonder's card doesn't confuse players.