Prefab Custom Inspector Script - Odd Behaviour

Hello,

I have a GameObject in my scene with a script (PrefabManager) on it that references a bunch of Prefabs in the Project window. Note, these Prefabs are NOT within the scene.

When I drag these prefabs into the scene, the PrefabManager is still referencing the Prefab from the Project (not the scene) - which is fine, this is normal.

So when I delete the prefab from the scene, the reference is not broken (as it's referencing from the Project.

• However ...

When I put a custom Inspector Editor script on the Prefab that overrides the 'OnInspectorGUI', the reference from the PrefabManager does something very odd!

If I now drag a prefab into the scene, the reference from the Manager is now referencing the prefab in the Scene, and NOT the project anymore.

Thus - if I now delete the Prefab from the scene, the reference is broken.

Any ideas as to why this is happening? I it due to serialising?

My Custom Inspector Script:

 public override void OnInspectorGUI(){
 
         InventoryModule _target =(InventoryModule)target;
 
         //build a name list for all buildings in inventory system
         int _selection = FindNameInBuilding(_target._name);
         string[] _names = GetBuildingNames();
 
         _selection = EditorGUILayout.Popup("Name ", _selection, _names);
 
         BuildingObject _building = GetBuilding(_selection);
 
         if(_building == null){
             _target._name = "";
             _target._buildingObject = null;
 
             EditorGUILayout.HelpBox("Please select a Building Name to populate module.", MessageType.Error);
         }
         else{
             _target._name = _names[_selection];
             _target._buildingObject = _building;
         }
     
         DrawDefaultInspector();
     }

All this is doing is making a List of possible strings given from 'GetBuildingNames'. This is then passed as a string into the target.