It seems like $registry can also be of type null; however, parameter $registry of Ynlo\GraphQLBundle\Test\...reLoader::__construct() does only seem to accept Doctrine\Bundle\DoctrineBundle\Registry, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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$fixturesLoader = new FixtureLoader($container, /** @scrutinizer ignore-type */ $registry);