If you're experiencing multiple issues or if nothing seems to work in the new version of Bundle Builder, the problem might be related to the Shopify Bundles app. The latest version of Bundle Builder relies on the Shopify Bundles API, so the Shopify Bundles app must be installed and compatible with your shop.
To check if this is the case, go to your apps and search for Shopify Bundles. If it's not installed, simply install it. If you encounter an error stating "The Shopify Bundles app is currently not compatible with this store," you'll need to check the eligibility requirements here.
Ensuring compatibility with the Shopify Bundles app is crucial for the smooth functioning of the Bundle Builder app.