Decoupling popular recording

Could you listen to the linked preview clip to make sure it’s not just uncredited?
I don’t know how Christina Aguilera sounds like.


Oh sorry, hearing these previews, I see she sings on track 12.
So indeed this recording should be split.

We first have to check edit history to see if it was created for the duet version and was later hijacked by the solo version. Or the opposite.

Apparently the recording was created for solo version but then multiple recording merges occured.