By chance I recognized that routes made in Komoot are now transferred tp Garmin Explore with embedded highlights as course points. This seems to be new. And even better, now the routes can be edited and will not be truncated as before. It is possible to add course points in GE mobil without that the other course points vanish.
This seems to be nice, but my experience with following a Komoot route with course points is this:
1. Navigation setting routing off, so that in 'up ahead' the course points are shown. I used a routable frikart map and disabled the topoactive map. First course point showed much too short distance (20 meters instead of 400 meters). After walking a while the distance seemed to become reliable. On purpose I went of the course (purple line) without that the H1 gave me a warning. I came close to the first course point, but in the up ahead list the distance showed now a much too long distance.
2. I stopped navigation and started the same course with routing on. The now magenta line showed a straight line to the starting point and forward along the course. I followed the route for a while and got the correct voice prompts for the turn points. When on purpose I did not followed the route, I got no warning at all and after a while the the course was truncated. I stopped the navigation and restarted it with the same setting. It worked again till I quit the route the next time. So, when using a Komoot route/course, you have to stay on it.
3. I thought that maybe the problems are because the topomap was disabled and enabled it. I made a new Komoot route and transferred it to the H1. Navigation setting was routing on. Now the map on H1 showed every turn point like a way point. The voice prompt told me the distance till every turn point but also to a course point and even called it by name. Because of the many points, the H1 was almost permanently talking. Before reaching the first course point, I went of the course. Recalculating was now fast as normal, every 50 meters, if you are not on the course. Then all course points and turn points on the map vanished. The course showed now the shortest way to the destination and voice prompts were accordingly. The Navigation setting no more showed the name of the course, but coordinates instead.
My conclusion: better don't use Komoot routes on an H1, maybe even not on any Garmin device.