PhpStorm false positive warnings in services.xml

PhpStorm shows false positive warnings about the typical services.xml boilerplate code, although I have Symfony and Shopware support enabled, and I even added the xmlns and xsd to my Language Settings explicitly.

What is wrong?

services.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
    </services>
</container>

PhpSotrm „Problems“:

Screenshots: