Why EF navigation property return null?

Question

I have two model 1)

public class Indicator
{
    public long ID { get; set; }
    public string Name { get; set; }
    public int MaxPoint { get; set; }
             


        

Answer 1

Same behavior, but different root cause than selected answer:

Navigation property can also be null if you turned off myContext.Configuration.AutoDetectChangesEnabled

Very obvious, but this got me when I was implementing some performance improvments.