The tag is correct! Then which tag you use whe you listen to RED LINE ～for TA～? With "(Original mix)" or with "[album version]"? Both tracks are different. You can't listen none of those tracks with "RED LINE ～for TA～" tag then, right?
Yes, I'll listen to MOON when the album is released, but if I'm listening to all singles through then I'll listen MOON (Original mix) again. I like to see my tags exactly like they should be, I don't mind seeing songs twice in my charts. But I do get your point, too, it's just that I'm addicted to tagging everything 100% right. :)
I know this is the "good" tag but once the album will come out, you'll simply listen to MOON. So you will have the song twice in your charts, that's why it's better to use MOON tag now. Moreover, it's better to see one song in ayu's charts.
Wrong tag guys, please use MOON. it's better for your charts, 'cause when the album will come out, you'll listen to blossom and not the original version. Let's avoid the song to appear twice in your charts.