I had the same issue few months ago. What helped was deactivating all advanced app clips + deleting/deactivating all default app clip experiences.
App Store Connect doesn't show these for whatever reason but you can do that via API.
Find all default app clip experiences
Deactivate all of them
Wait few hours/days and it will show a Safari notification instead of app clip
https://developer.apple.com/documentation/appstoreconnectapi/get-v1-appclips-_id_-appclipdefaultexperiences
https://developer.apple.com/documentation/appstoreconnectapi/delete-v1-appclipdefaultexperiences-_id_
Topic:
App Store Distribution & Marketing
SubTopic:
General
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