1

_Edit: So I have found out that EditorUtility.SetDirty() is obsolete. How do I save it then? _

I am making a Item database, inspired by BurgZerg, and for some reason, my list in the Database doesn’t save after unity reload or it erases all data after I save a the ItemDatabase.cs even tho I have EditorUtility.SetDirty() after every change.

using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEditor;

public class ItemDatabase : ScriptableObject {

	[SerializeField]
	List<Item> items = new List<Item> ();

	public void Remove(Item item) {
		items.Remove (item);
		EditorUtility.SetDirty(this);
	}

	public void RemoveAt(int index) {
		items.RemoveAt (index);
		EditorUtility.SetDirty(this);
	}

	public void Add(Item item) {
		items.Add (item);
		EditorUtility.SetDirty(this);
	}

	public int CountItems() {
		return (int)items.Count;
	}

	public Item Item(int index) {
		return items.ElementAt (index);
	}

}
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Take a look here:

Take a look at all the answers there, maybe one will give you a clue.