Someone drawn the segments of district borders in Johor and made relations, but did not remove the originally drawn district borders which were drawn as closed ways (such as Segamat relation https://www.openstreetmap.org/relation/12306079 and way https://www.openstreetmap.org/way/809887669)). Most of them are incomplete and the section where it is a coastline or bordering with another state didn’t include in the relation. And somehow that user made another relation for Johor (https://www.openstreetmap.org/relation/12306082). Also the southern portion of Muar/Tangkak district border should follow Muar River instead of going to the west and border with Melaka.