title: Why EF navigation property return null?
body: <p>I have two model
  1)</p>
  
  <pre><code>public class Indicator
  {
      public long ID { get; set; }
      public string Name { get; set; }
      public int MaxPoint { get; set; }
      public string Comment { get; set; }
      public DateTime DateChanged { get; set; }
      public DateTime DateCreated { get; set; }
  
      public virtual IList&lt;CalculationType&gt; CalculationTypes { get; set; }
      public virtual IList&lt;TestEntity&gt; TestEntitys { get; set; }
      public virtual IndicatorGroup IndicatorGroup { get; set; }
  }
  </code></pre>
  
  <p>2)</p>
  
  <pre><code>public class CalculationType
  {
      public long ID { get; set; }
      public string UnitName { get; set; }
      public int Point { get; set; }
      public DateTime DateCreated { get; set; }
      public DateTime DateChanged { get; set; }
  
      public virtual Indicator Indicator { get; set; }
      public virtual IList&lt;Сalculation&gt; Calculations { get; set; }
  }
  </code></pre>
  
  <p>I executing this code</p>
  
  <pre><code>var indicator = DataContext.Indicators.FirstOrDefault(i =&gt; i.ID == indicatorID);
  var test = DataContext.CalculationTypes.FirstOrDefault();
  </code></pre>
  
  <p>first line return null on navigation property CalculationTypes
  <img src="https://i.stack.imgur.com/hdemq.png" alt="enter image description here"></p>
  
  <p>Second line return empty collection.<img src="https://i.stack.imgur.com/sh87K.png" alt="enter image description here"> Why?</p>
  
  <p><strong>UPDATE</strong>
  snapshot database
  <img src="https://i.stack.imgur.com/NKr1Z.png" alt="enter image description here"><img src="https://i.stack.imgur.com/neKhr.png" alt="enter image description here">
  project link <a href="https://github.com/wkololo4ever/Stankin" rel="noreferrer">https://github.com/wkololo4ever/Stankin</a></p>
  
  <p>added Calculation</p>
  
  <pre><code>    public class Сalculation
  {
      public long ID { get; set; }
  
      public virtual CalculationType CalculationType { get; set; }
      public virtual ApplicationUser Creator { get; set; }
  }
  </code></pre>