Problem reading a GPX file

[routeconverter]

One thing more, RouteConverter don't read the speed data even in the original file is the speed:

        <trkpt lat="40.139935" lon="-6.032712">
            <time>2018-08-23T10:59:05Z</time>
            <speed>25.45</speed>
            <extensions>
                <gpxtpx:TrackPointExtension>
                    <gpxtpx:hr>103</gpxtpx:hr>
                </gpxtpx:TrackPointExtension>
            </extensions>
        </trkpt>

But also RouteConverter doesn't write the speed info in the file even if you complete the points and it "kills" the initial speed info, deleting the <speed></speed> fields.

This isn't valid GPX 1.1 and thus RouteConverter ignores it. There is simply no <speed> element defined in GPX 1.1

This is valid since it uses an extension from Garmin:

        <trkpt lat="50.63688" lon="8.141465">
           <ele>635.0</ele>
           <time>2013-08-30T14:58:18.000Z</time>
           <name>Waypoint 8</name>
           <extensions>
              <gpxtpx:TrackPointExtension xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v2">
                 <gpxtpx:speed>2.2</gpxtpx:speed>
              </gpxtpx:TrackPointExtension>
           </extensions>
        </trkpt>