NC11 PHP 7.1 Error: PHP Module 'xxx' already loaded at Unknown#0

A couple of times a second there is an addition to the Log with the text:
Error PHP Module ‘Phar’ already loaded at Unknown#0

When I switch ‘Phar’ off in PHP Selector | extensions (cPanel at my provider) the next message is coming, and the next. Until I turn of ‘pdo’, and then the site does not work any more.

So I guess that in the PHP code of NC11 a request has to be done if the extension is loaded, if not then load the extension…

PHP 7.1 is still experimental for Nextcloud. Best is to report problems directly to the bugtracker.
There are known problems with 2FA and mail app: