FQSEN resolution failure

test.php

<?php

namespace foo{
    class y
    {
    }
}
namespace bar{
    use foo\y;
    use phpDocumentor\Reflection\Types\ContextFactory;
    use phpDocumentor\Reflection\DocBlockFactory;
    use ReflectionClass;

    require_once "vendor/autoload.php";
    /**
     * @property y $bin
     */
    class z
    {
    }
    $docblockfactory = DocBlockFactory::createInstance();
    $contextfactory = new ContextFactory();
    $x = new /** @property y $bin */ class {
    };
    $y = new z();

    // This works:
    $reflectionClass = new ReflectionClass(get_class($y));
    $context = $contextfactory->createFromReflector($reflectionClass);
    $docblock = $docblockfactory->create($reflectionClass, $context);

    /*
    * Fails with:
    * PHP Fatal error:  Uncaught InvalidArgumentException: "\class@anonymous in vendor\phpdocumentor\reflection-common\src\Fqsen.php:51
    *    Stack trace:
    *   #0 vendor\phpdocumentor\type-resolver\src\FqsenResolver.php(67): phpDocumentor\Reflection\Fqsen->__construct('\\class@anonymou...')
    *   #1 vendor\phpdocumentor\type-resolver\src\FqsenResolver.php(37): phpDocumentor\Reflection\FqsenResolver->resolvePartialStructuralElementName('y', Object(phpDocumentor\Reflection\Types\Context))
    *   #2 vendor\phpdocumentor\type-resolver\src\TypeResolver.php(384): phpDocumentor\Reflection\FqsenResolver->resolve('y', Object(phpDocumentor\Reflection\Types\Context))
    *   #3 vendor\phpdocumentor\type-resolver\src\TypeResolver.php(291): phpDocumentor\Reflection\TypeResolver->resolveTypedObject('y', Object(phpDocumentor\Reflection\Types\Context))
    *   #4 vendor\phpdocumentor\typ in vendor\phpdocumentor\reflection-common\src\Fqsen.php on line 51
    */
    $reflectionClass = new ReflectionClass(get_class($x));
    $context = $contextfactory->createFromReflector($reflectionClass);
    $docblock = $docblockfactory->create($reflectionClass, $context);
}