@pavel.samokha Looking at my watch, I see 9 routes there. Although I am surprised to see some of the older routes that I am sure I had previously unselected. I use two different watches, which sometimes makes some old routes come back. When I switch watches, it brings some routes back because the watch I switch to have them. And then I switch again to another watch and that watch gets all the routes that were brought back from another watch. That is a pain to mange!
Still, with 9 routes this should have worked.
By the way, the ability to send one-shot navigation route to the watch continued to be disabled until I restarted the watch. Now it is available again.
