route relations provoke conflicts when merging?

[dieterdreist]

There appears to be something wrong in JOSM latest, I am not completely sure, what but I am quite sure that this is a degradation of something which worked before.

given: two roads with some bus routes on them, where road A stops the road B starts (i.e. they are continuous)
What I did:

1. split one road (A) in 2 parts ("p")
2. recombine the piece of A with the rest of B ("c").

I got a window asking me about one conflicting tag (the street name), no surprise because this was the reason for my edit, so I correct it from the suggested "A;B" to "B" and continue.

Now I try to upload. Message: "uploading failed because of a conflict", what do you want to do? (I do "synchronize whole dataset").and it turns out that 16 conflicts are reported, all happen to have to do with this routes. I go to conflict resolution and choose 16 times "my version". On the next upload try I get this: "Uploading to the server failed because your current dataset violates a precondition. The error message is: ResponseCode=412, Error Header=<Precondition failed: Relation with id 2437875 cannot be saved due to Way with id 183155622>"