iOS 1Password 8 demanding master password / Face ID every time I try to auto fill

Whenever I tap on a login/password field (website viewed on iOS Safari) and then tap on the login information associated to 1Password that's shown above keyboard, a 1Password screen appears demanding either the master password or Face ID authentication. To use Face ID, I have to manually tap the icon, it's not automatic. After doing so, login and password are filled.

This afternoon I've uninstalled 1Password 7 and installed the version 8, when this problem started to happen. 1Password 7 did NOT behave like this. After tapping the login information shown above the keyboard, a Face ID icon would appear and the credentials were filled. Not even the 1Password sheet/screen used to appear.

I've reviewed my settings and they seem to be OK, on par with how they were when 1Password 7 was installed. I also don't think a reinstallation would fix this, since I've first uninstalled version 7 and then installed version 8. First login to the app was made with the Emergency Kit informations manually inserted. The iPhone has already been restarted after version 8 installation and configuration.

iOS Safari extension is DISABLED. I prefer to use the OS built-in autofill solution.

Can anyone help?

Below are related screenshots.

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1Password Version: 8.9.0
Extension Version: Not Provided
OS Version: iOS 15.6
Browser:_ Safari for iOS