I'm experiencing this issue too. I was wondering if there's been any 
progress on finding a solution.

On Wednesday, 27 April 2022 at 4:30:09 am UTC+2 egor.g...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:

>
> Dear list members,
>
> I apologize if this question has already been asked -- I have tried to 
> look it up, but haven't been able to find anything relevant.
>
> I have a problem in a document that contains several citations to the 
> works published by the same author in the same year invoked using the minus 
> sign: '-@citation'. The disambiguating letters ('a', 'b') are not inserted, 
> leading to a confusing situation with multiple entries listed by the same 
> author and year.
>
> Here is the source Markdown:
>
> As John Smith [-@smith2008a; -@smith2008b] mentioned repeatedly, 
> everything is good.
>
> And here is the bibliography:
>
> @book{smith2008a,
> author = {Smith, J.},
> date = {2008},
> title = {Life is good},
> publisher = {Cambridge University Press},
> language = {en},
> address = {Cambridge}
> }
> @incollection{smith2008b,
> author = {Smith, J.},
> date = {2008},
> title = {Has life ever been so good?},
> editor = {Red, D. and Stevenson, H.},
> publisher = {edition forum},
> pages = {103–34},
> language = {en},
> booktitle = {On the goodness of life},
> address = {Heidelberg}
> }
>
> Output:
>
> As John Smith (2008, 2008) mentioned repeatedly, everything is good.
> References
> Smith, J. 2008. “Has Life Ever Been so Good?” In On the Goodness of Life,
> edited by D. Red and H. Stevenson, 103–34. Heidelberg: edition forum.
> ———. 2008. Life Is Good. Cambridge: Cambridge University Press.
>
> If I add a sentence where the citations are invoked without the minus 
> sign, the problem disappears:
>
> Markdown:
>
> As John Smith [-@smith2008a; -@smith2008b] mentioned repeatedly, 
> everything is good. However, in @smith2008b he lists some exceptions, 
> which he doesn't mention in @smith2008a. 
>
> Output:
>
> As John Smith (2008b, 2008a) mentioned repeatedly, everything is good. How-
> ever, in Smith (2008a) he lists some exceptions, which he doesn’t mention 
> in
> Smith (2008b).
> References
> Smith, J. 2008a. “Has Life Ever Been so Good?” In On the Goodness of Life,
> edited by D. Red and H. Stevenson, 103–34. Heidelberg: edition forum.
> ———. 2008b. Life Is Good. Cambridge: Cambridge University Press.
>
> I vaguely remember that this problem was absent in an older version of 
> Pandoc (2.9.2.1 with pandoc-citeproc 0.17)  in my Debian Bullseye, which 
> I used to produce the initial version of the document in question.
>
> Would much appreciate any suggestions!
>
>
>

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