hey man,
in AddToCache() method u are getting a component in a parent of Ore (GetComponentInParent), i wonder why?

any ore spawned in the World doesnt have parent, its ok, unity will give correct answer, but if we spawn it with some parenting - we would get an error.

 else if (trackOre && entity is OreResourceEntity)
            {
                if (!cache.Ores.ContainsKey(position))
                {
                    float amount = 0;
                    foreach (var item in entity.GetComponentInParent<ResourceDispenser>().containedItems)
                    {
                        amount += item.amount;
                    }

                    cache.Ores.Add(position, new CachedInfo { Name = _(entity.ShortPrefabName), Info = amount });
                    return True;
                }

                return False;
            }

thanks, will change it to GetComponent instead