Gift Registry/ Wishlist not working after theme change

[JBICBV]

We've had the store live for a couple years, and had no issues with the registry system, but after changing to Combine, customers are now complaining that the registry is not working. There was no way to add anything to the registry, until we changed the app embeds setting from 2.0 (default) to 1x vintage. On that change, customers were able to see the gift box and heart icons for the registry/ wishlist, but the functionality still is not there. The hearts fill in when clicked, and persist on page changes and reloads, but the wishlist page from menu goes to nothing. he registry gift boxes do not show any sign of registering that they've been clicked, and the registry does not show any items in the front facing registry, under manage. We have been able to see some items in the back end. Wat can we do to get this working, as it is affecting business at this point, and there have likely been others who have had issues and just not mentioned it. Thx for any guidance!