I would like to follow this thread.
My previous post on this topic (with screenshots and a link) was (probably) marked as spam. So this time I'm writing one with a new post with a link only:
When selecting multiple routes in a collection, deselecting routes and reselecting routes in a collection, the map annotations don't work as expected. Sometimes no annotations are displayed and sometimes annotations of more routes than selected are displayed.
My demo to reproduce annotation errors.