Panda Express Sign in with Apple asks for Password

I recently tried to set up an account with Panda Express app. When trying to sign in with Apple, the app asked for my iCloud password. This seems off to me. Indeed, the official web page for Sign in with Apple clearly says:

At your first sign in, apps and websites can ask only for your name and email address to set up an account for you.

https://support.apple.com/en-us/HT210318

Should I be concerned? Is this normal for an app to request iCloud credentials?

Thanks, Marty