In Case Knowledge article is attached but its not attached to knowledge gap raised to same case

[Kushi test]

Hello 

In OOB Case table in workspace view we have 2 related list Attached Knowledge and Knowledge Gap 

But when a case has knowledge article attached to it, and we create Knowledge Gap, that knowledge article is not getting attached to knowledge gap(KFT). Why it is so?

Thanks in Advance
Regards 
Kushi