When you restore an app in another account and you want to change the Connector (to work with another DB), the Data Resources keep the connection data from the old source.
So to solve it, you need to make a copy of Data Source, delete the original and rename the copy with the original name.
This process is quite annoying.
In previous versions, such a process was not necessary.
Please vote: https://tracker.appgyver.com/bug-reports/p/data-resources-dont-change-when-define-a-new-connector