I am a PhD student in mathematics. One of my article (say, paper A) is under review in a journal (say, journal J), where I have mentioned my next article (say, paper B) as a reference (which is completed but yet to be submitted in arxiv). The problem is that the reference or paper B has a co-author with me. But the co-author is not collaborating anymore, as of now. Moreover, not responding my emails, not looking at the paper B. So it might happen that he can let me know that he is not interested anymore in the paper B, so before submitting it to arxiv or journal, I have to remove his name from paper B.
Now suppose my paper A gets accepted from the journal J, in which it is under review, in that case I have to adjust the reference by removing the co-author.
In that situation, how would the editor or referee of the journal would react?