I'm having the same problem now for an "advanced" app clip experience I submitted a week ago. Older app clips with the same URL but a different query parameter are working fine. Does Apple really support app clips any more? They were first available with iOS 14 and the process is still buggy and frustrating. They should at least give some guidance on what "Received" means and how long to reasonably wait before it's working.

bump. Is Apple listening?

Yes. Not sure. Re-downloaded.

I think this is a bug. The link you included states "Upon launch, the App Clip receives a URL, then extracts path components and query parameters", but the example given only includes path components. Additional query parameters shouldn't be a problem. Specifically, I think the bug happens when your invocation URL already includes query parameters. Until when or if it's fixed, I would suggest removing the query parameters from your invocation URL or turn them into path components if possible.