Solved Entity spawn bug

Hello. I'm maked simple plugin, that allow to spawn entity. But when I restart server, entity due unknow reasons is despawning. I tried to use slapper, but this have same problem. Any idea?

Code ?

Here:

PHP:

                    if(strtolower($args[0]) == "bridges"){
                        $nbt = new CompoundTag ("", [ 
                            "Pos" => new ListTag( "Pos", [ 
                                new DoubleTag("", $sender->x),
                                new DoubleTag("", $sender->y + $sender->getEyeHeight()),
                                new DoubleTag("", $sender->z) 
                            ]),
                            "Motion" => new ListTag ( "Motion", [ 
                                new DoubleTag("", 0),
                                new DoubleTag("", 0),
                                new DoubleTag("", 0) 
                            ]),
                            "Rotation" => new ListTag("Rotation", [ 
                                new FloatTag("", $sender->yaw),
                                new FloatTag("", $sender->pitch) 
                            ]) 
                        ]);
                        $mob = Entity::createEntity(Villager::NETWORK_ID, $sender->chunk, $nbt);
                        $mob->setMaxHealth(1000);
                        $mob->setHealth(1000);
                        $mob->setNameTag("§l§eTheBridges");
                        $mob->spawnToAll();
                    }


is your entity registered?

Yes

Ok, fixed. Thanks you all.