The title says by itself.
We've been using advanced app clips a lot and have created more than hundreds of advanced app clips for the customers.
Suddenly, few days ago, the most recently created advanced app clips stopped working as they got stuck with CREATE_SUBMITTED status.
It seems like it has already happened before to someone else: https://developer.apple.com/forums/thread/763374
It probably be OK if it showed a Safari notification but it shows an error due to another bug reported here: https://developer.apple.com/forums/thread/803187