Here is the procedure:
1. Select any POI/Waypoint and «Track to Here»
The app will now draw a line from current location to the selected POI/Waypoint
2. After several seconds, «Record Track»
The app will start to record Track by drawing a line from previous position to current position.
At this point, the «Track To Here» line disappears.
If I were to reverse the process, or perform step #1 again, that line is redisplayed again.
I believe this is a bug. That «Track to Here» line should not disappear. It should be visible until explicitly removed by the user.