Hello Vera,
I am sorry but https://www.openstreetmap.org/changeset/134186550 do not help much.
The members of most route relations including `route=road` and `route=bus` + `public_transport:version=2` need to be ordered by connectivity. Please, carefully read the wiki, e.g. https://wiki.openstreetmap.org/wiki/Relation:route and the linked pages.

Sorry, I have no on-the-ground information but regarding the `lanes` tags, it is quiet unusual to have `lanes:forward` and `lanes:backward`. From the Maxar images it looked like `lanes=1` for all involved way and that's what I chose but if in doubt deleting all lanes tag after a reconstruction is better than keeping wrong, outdated information.

I have fixed all errors in https://www.openstreetmap.org/changeset/134195299 but next time please work more carefully and/or leave the complex situations for a colleague with more mapping experience and hopefully some knowledge of JOSM and route relations.

Take care,
skyper