Mcpe blocks register

I tried to add new blocks to the core (Like as Shroomlight or basalt and etc).

But I am getting an exception.
Is this even possible?

Using method:
BlockFactory::registerBlock(new Shroomlight(), true);

Exception:
Index invalid or out of range

Shroomlight class:

PHP:

use pocketmine\block\Transparent;
use pocketmine\block\BlockToolType;

class Shroomlight extends Transparent{
    
    protected $id=485;
    
    public function __construct(int $meta=0){
        $this->meta=$meta;
    }
    public function getName() : string{
        return "Shroomlight";
    }
    public function getHardness() : float{
        return 1;
    }
    public function getToolType() : int{
        return BlockToolType::TYPE_HOE;
    }
    public function getLightLevel() : int{
        return 15;
    }
}

 

you can't have blocks with IDs higher than 255 in PM3