text: I can't reproduce it https://i.postimg.cc/Hsf2F76H/osmand.jpg
  Probably it was due to a re-routing that happened when I missed the M9 direction of a former route I was following.
  
  I think the no-U-turn-restriction is implicit but certainly it depends on some assumptions on the road (is it allowed to overtake? is it on an urban area?) and local driving laws. Since this debate is beyond the purpose of the note, I'll close it and let it to Osmand to avoid this buggy routing.
  
  Thanks everyone