Infobar timestamp displays "undefined" with KML tracking

[Embret]

When using the infobar with KML tracking the timestamp value displays "undefined". Coordinates are displaying as expected.

My page shortcode: [tsmap live=y points=y infobar=y height=640px kml=proxy:https://share.garmin.com/Feed/Share/vandrerblogg?d1=2021-07-13T06:19z&d2=2021-07-28T23:59z]

My shortcode infobar template looks like "Siste spor - Tidspunkt: {timestamp} - Koordinater: {lat},{lon}"

My map infobar displays like this:

Here is the KML data of the last track i receive from the garmin link in the shortcode:

      <Placemark>
        <name>Magnus Embret Henriksen</name>
        <visibility>true</visibility>
        <description />
        <TimeStamp>
          <when>2021-07-27T13:44:15Z</when>
        </TimeStamp>
        <styleUrl>#style_2049742</styleUrl>
        <ExtendedData>
          <Data name="Id">
            <value>38201770</value>
          </Data>
          <Data name="Time UTC">
            <value>7/27/2021 1:44:15 PM</value>
          </Data>
          <Data name="Time">
            <value>7/27/2021 3:44:15 PM</value>
          </Data>
          <Data name="Name">
            <value>Magnus Embret Henriksen</value>
          </Data>
          <Data name="Map Display Name">
            <value>Magnus Embret Henriksen</value>
          </Data>
          <Data name="Device Type">
            <value>inReach Mini</value>
          </Data>
          <Data name="IMEI">
            <value>300434035412970</value>
          </Data>
          <Data name="Incident Id">
            <value />
          </Data>
          <Data name="Latitude">
            <value>69.712221</value>
          </Data>
          <Data name="Longitude">
            <value>22.239118</value>
          </Data>
          <Data name="Elevation">
            <value>118.34 m from MSL</value>
          </Data>
          <Data name="Velocity">
            <value>5.0 km/h</value>
          </Data>
          <Data name="Course">
            <value>247.50 ° True</value>
          </Data>
          <Data name="Valid GPS Fix">
            <value>True</value>
          </Data>
          <Data name="In Emergency">
            <value>False</value>
          </Data>
          <Data name="Text">
            <value />
          </Data>
          <Data name="Event">
            <value>Tracking message received.</value>
          </Data>
          <Data name="Device Identifier">
            <value />
          </Data>
          <Data name="SpatialRefSystem">
            <value>WGS84</value>
          </Data>
        </ExtendedData>
        <Point>
          <extrude>false</extrude>
          <altitudeMode>absolute</altitudeMode>
          <coordinates>22.239118,69.712221,118.34</coordinates>
        </Point>
      </Placemark>

Is there anything i can do to get the timestamp to show the time of the last KML track?