How to edit a shared group?

I have two databases and a shared group between them. How can I add an item in the shared group using PyKeePass in such a way that both databases see the change? If I add the item directly in the GUI in one of the databases, the second one syncs the change. However, if I add it through PyKeePass, only the first database sees the change but the second one does not sync it. How can I do this?