Google Authenticator extension: use HTML "autocomplete" attribute
Use HTML autocomplete="false" on the 6-digit PIN input field, so the browser autocomplete feature will not suggest past PINs.
Since these are always one-time use, it never makes sense to remember and autocomplete values of the PIN entry field.
Thank you for reporting this bug.
Note: only feature requests are allowed here, so we would appreciate if you post the bug for Google Auth extension in comments at https://ext.plesk.com/packages/d6d6e361-b55d-467f-8b97-6426174c77a1-google-authenticator. We are closing this request, since it does not contain any feature suggestions.