Deserialization to classes created from XSD does not contain all data

I wanted to deserialize TCX files containing sport data into some my local/temporary object. I used XSD schema describing such format and created classes using xsd2code.

After that I was able to deserialize XML into proper object and the deserialzator didn't throw any exception. But when I started to expand behaviour of component I noticed that some fields are not properly fullfield.

The problem is about reading the tags Track. Deserialized Lap in substructure shows all data properly, but the Tracks number is displayed as 0.

Is there any way to trigger deserializer to interpret it properly? Did I miss some attribute? Why it is not reading it properly even if there was no exception.

I know, it is hard to explain and put all needed classes into comment - so I share my current status here and just write that: GetUnifiedData_WhenTrackPointsAreGivenInTcx_UnifiedTrackPointShouldRetreiveIt() is not passing and shows my problem.

<Activities>
 <Activity Sport="Running">
  <Id>2015-01-25T12:14:34Z</Id>
  <Lap StartTime="2015-01-25T12:14:34Z">
    <TotalTimeSeconds>507.0989990</TotalTimeSeconds>
    <DistanceMeters>1000.0000000</DistanceMeters>
    <MaximumSpeed>2.5790000</MaximumSpeed>
    <Calories>95</Calories>
    <AverageHeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">
      <Value>155</Value>
    </AverageHeartRateBpm>
    <MaximumHeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">
      <Value>173</Value>
    </MaximumHeartRateBpm>
    <Intensity>Resting</Intensity>
    <TriggerMethod>Distance</TriggerMethod>
    <Track>
      <Trackpoint>
        <Time>2015-01-25T12:14:34Z</Time>
        <Position>
          <LatitudeDegrees>50.8918607</LatitudeDegrees>
          <LongitudeDegrees>16.7403161</LongitudeDegrees>
        </Position>
        <AltitudeMeters>233.1999969</AltitudeMeters>
        <DistanceMeters>0.0000000</DistanceMeters>
        <HeartRateBpm xsi:type="HeartRateInBeatsPerMinute_t">
          <Value>88</Value>
        </HeartRateBpm>
        <Extensions>
          <TPX xmlns="http://ift.tt/1svKk32" CadenceSensor="Footpod">
            <Speed>0.0000000</Speed>
          </TPX>
        </Extensions>
      </Trackpoint>
    </Track>
    <Track>
    </Track>
    <Extensions>
      <FatCalories xmlns="http://ift.tt/1Jj0xpP">
        <Value>0</Value>
      </FatCalories>
      <LX xmlns="http://ift.tt/1svKk32">
        <AvgSpeed>1.9720000</AvgSpeed>
      </LX>
    </Extensions>
  </Lap>
</Activity>
</Activities>