Hi, 
Thank you for writing us. In accordance with the recommendations listed in the OSM wiki, the editor removed service=busway tagging on the segment. The wiki states that we don't have the tag service=busway. The attribute bus=yes has already been tagged on the road indicating the road to be accessible by buses and the tag busway=* denotes the presence of at least one bus lane on one or more sides of the road. Please feel free to add your recommendations. 
Regards,
Deepikja 