It's seems that you've applied the name you found by survey and whatever method you're using to make that change, it's combining two ways. Since some bus routes will only use one of the segments, that one segment will either be deleted or will have the nodes of both segments. Either way, if the bus route is not changed it will create a gap since the relation can't find the way or finds it but the end node isn't shared with the next way.

I see you've used iD for this changeset, how are you applying the names? If you select both ways and do "combine" it will result in this error, if you select both ways and just change the name to both simultaneously, this error will not happen