It seems like $request->getParsedBody() can also be of type null and object; however, parameter $data of Yiisoft\Form\FormModel::load() does only seem to accept array, maybe add an additional type check?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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if ($form->load(/** @scrutinizer ignore-type */ $request->getParsedBody()) && $form->validate()) {