Something annoying with Spotify is that some releases, especially singles, will not have the featuring artist set at release level but only track(s).
I think in such cases where all track artists are the same it should be applied to the release artist too. (Apple Music however seems to put them in the title as feat. instead)
See also:
This is not limited to Japan releases. Examples:
https://open.spotify.com/album/2KvaR6ovudAscP0J7p2PDwhttps://open.spotify.com/album/10nXxlMIWG8ZtypFsMX8WGhttps://open.spotify.com/album/5CJRnF6DMcoOzzEFgC9lcv