koobas.hobune.stream
Prefab doesn't hold prefab of itself, Instead just copies itself on Instantiate()
An object named BuildingParent has a script called BuildingParentScript. That script should hold the prefab GameObject BuildingParent (not a copy of itself but it's own prefab). And when I assign it in the Inspector it seems to work. 
But if I leave and re enter the prefab editor in seems to set the GameObject to itself instead of its prefab. 
So when I instantiate it, it makes a copy of itself, that copies all the children. This object can hold up to 500 children, so just deleting them seems bad for performance. Any ideas?
try adding this to your script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class BuildingParentScript : MonoBehaviour
{
public GameObject newParentGO; // place the prefab building _parent here
public GameObject prefabReserve; // place the prefab building _parent here
void Update()
{
if(newParentGO != null)
{
newParentGO = prefabReserve;
}
}
}
I did the test and it worked
(Don't change the script, just add)
