Return value must be of type ?PhpParser\Node\Expr\Variable, PhpParser\Node\Expr\AssignOp\Concat returned"

[smortexa]

Reproduction:

Try to refactor:

if ( ! function_exists('formatSizeUnits')) {
    function formatSizeUnits($bytes): string
    {
        if ($bytes >= 1_073_741_824) {
            $bytes = number_format($bytes / 1_073_741_824, 1).' GB';
        } elseif ($bytes >= 1_048_576) {
            $bytes = number_format($bytes / 1_048_576, 1).' MB';
        } elseif ($bytes >= 1024) {
            $bytes = number_format($bytes / 1024, 1).' KB';
        } elseif ($bytes > 1) {
            $bytes .= ' bytes';
        } elseif (1 === $bytes) {
            $bytes .= ' byte';
        } else {
            $bytes = '0 bytes';
        }

        return $bytes;
    }
}

[ERROR] Could not process "/var/www/app/modules/CMS/src/Helpers/functions.php" file, due to:                 
         "System error:                                                                                                 
         "Rector\TypeDeclaration\Rector\ClassMethod\StrictStringParamConcatRector::resolveVariableConcattedFromParam(): 
         Return value must be of type ?PhpParser\Node\Expr\Variable, PhpParser\Node\Expr\AssignOp\Concat returned"

[samsonasik]

The crash reproduced at https://getrector.com/demo/36fc83c8-43ca-48a8-84cd-4500f534aa29 by StrictStringParamConcatRector

[github-actions]

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