According to its history, this relation https://www.openstreetmap.org/relation/2620918 already exists since 2012 as a type=multilingestring. I'm not sure either what its exact purpose is, so I did not explicitly change this relation's tags, nor change/add this type. The only reasons it shows up in this changeset is likely because some of its individual members (boundary ways) have been cut up to be able to add the correct sections to the newly created submunicipal boundary relations? If there is no added value/reason (anymore) for the multilinestring relation I *suppose* it could be deleted, but otherwise keep it as is?