The UNKNOWN_OBJECT_TYPE has been declared as [ReadOnly], but you are writing to it.

SetTraitOnObjectAtIndex gives me a readonly error. what am I doing wrong?

public IEnumerator Sleep(GameObject bedObject)
{
stateData = (StateData)m_Controller.CurrentStateData;
var traitBasedObjects = new NativeList<int>(4, Allocator.TempJob);

foreach (var needObjectIndex in stateData.GetTraitBasedObjectIndices(traitBasedObjects, new ComponentType[] { typeof(Need) }))
{
var need = stateData.GetTraitOnObjectAtIndex<Need>(needObjectIndex);
if (need.NeedType == NeedType.Fatigue)
{
need.Urgency = 0;
stateData.SetTraitOnObjectAtIndex(need, needObjectIndex);
// alternatively SetValue works but is it the same?

//m_NeedTraitData.SetValue(Need.FieldUrgency, need.Urgency);

yield return null;
}
}
traitBasedObjects.Dispose();
yield return null;
}