When providing segment names, sometimes the auto completion overrides correct street names with the already provided wrong title. I found no other way of overriding it except deleting the wrong name from all segments that use it and saving them without a name. Afterwards it's possible to add the name. This is especially problematic when one just needs to adjust something from lower to upper case and the other way round.

In my opinion there should be an option like a cross at the end of the auto completion menu that closes it and offers the ability to provide a new title.