@bentaye - Correct. Ambiguity is only allowed in one direction. FYI - Here is my reply to same question from 2 yrs ago

... it is ambiguous in both directions (e.g could follow line all around or could go direct to other X). Ambiguity is not allowed.

Even when the original post is hidden, you could expand the replies and see the explanation there.

I think I understood, the fact that there is a choice to go right or down at the beginning makes it anbiguous so invalid. Is that correct?

It seems so.