It seems like $command can also be of type string; however, parameter $command of Symfony\Component\Process\Process::__construct() does only seem to accept array, maybe add an additional type check?
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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$process = new ProcessHandler(/** @scrutinizer ignore-type */ $command,root.'');