In some constellations routing works fine, but after creating and using a shortlink the route is only displayed partly, though all merkers are still there.
Screenshots of this route (tested in chromium and Firefox):

PS: some times it even occured that markers for one or two places were multiplied on a similar route like the one above but I could not reproduce this behaviour.
"Multiplied" means that there were five markers on the same place instead of one.