The method getCounter() does not exist on Psr\EventDispatcher\TaskInterface. It seems like you code against a sub-type of said class. However, the method does not exist in Psr\EventDispatcher\StoppableTaskInterface or SomeOtherTask. Are you sure you never get one of those?
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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-call annotation
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echo "task result was: {$testTaskResult->/** @scrutinizer ignore-call */ getCounter()}\n";