Slim Typo3 can't handle FileReferences

[justuskoester]

As soon as I add a new Field to my model, that is a FileReference, Slim stops working.

my model:
/**
* images
*
* @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\TYPO3\CMS\Extbase\Domain\Model\FileReference>
* @cascade remove
*/
protected $images = null;

Slim Error Message:
Table 'db.tx_extbase_domain_model_filereference' doesn't exist

Slim seems to try to access the table 'tx_extbase_domain_model_filereference', which of course does not exist, because the table from the Typo3 Core for FileReferences is 'sys_file_reference'.

Am I doing something wrong or is this a bug?