I am trying to add a song attribute to this song by entering it the Song Attribute menu. However, every time I enter "koji_kondo" or "近藤_浩治", the attributes "koji_kondo_1" and "近藤_浩治_1" respectively are created instead. The two former aliases already exist for this attribute but I cannot figure out how to add it to this song.
It seems that if a tag's display name contains a space instead of an underscore, registering the tag with the underscore included causes it to be recognized as a different tag.