code: public function save()
  	{
  		$filemounts = $this->filemounts;
  
  		if (!empty($this->arrFilemountIds))
  		{
  			$this->arrData['filemounts'] = $this->arrFilemountIds;
  		}
  
  		parent::save();
  		$this->filemounts = $filemounts;
  	}
docs: Restore the original numeric file mounts (see #5083)