Agreed that there's definitely something different in the behavior.
I looked through the HAR files I've captured comparing my company's app to Termly. After clicking "Continue", in both cases there's a redirect to a URL of the form https://accounts.google.com/signin/oauth/consent?as=redacted.... For my company's app, hitting that URL results in another redirect to my Auth0 tenant, whereas for Termly, hitting that URL results in HTML showing the loading indicator (no immediate redirect).
Why the difference? As you said, maybe it's something in the OAuth consent screen configuration (though there are no options I see that could explain it). Maybe it has to do with the age of the account.
I looked through the HAR files I've captured comparing my company's app to Termly. After clicking "Continue", in both cases there's a redirect to a URL of the form https://accounts.google.com/signin/oauth/consent?as=redacted.... For my company's app, hitting that URL results in another redirect to my Auth0 tenant, whereas for Termly, hitting that URL results in HTML showing the loading indicator (no immediate redirect).
Why the difference? As you said, maybe it's something in the OAuth consent screen configuration (though there are no options I see that could explain it). Maybe it has to do with the age of the account.