如何在引用中显示年份{a,b}，其中论文发表于同一年，但作者名单很长（第一作者相同）

Question

我有一份文档，其中引用了两篇论文，第一作者和年份相同。但是，如下例所示，作者列表很长。如您所见，引用已添加到文档中，但第二篇论文得到了 和?。该论文位于报告末尾的参考书目中，但 LaTeX 似乎不知道如何在主文档中处理它。有没有办法让它?用正确的引用（Brady et al. 2019b）替换 ，并且第一个是（Brady et al. 2019a）？

\documentclass[12pt,oneside]{report} 
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\begin{filecontents*}{mycitations.bib}
@article{Brady:2019fe,
author = {Brady, Steven P and Bolnick, Daniel I and Barrett, Rowan Douglas H. and Chapman, Lauren and Crispo, Erika and Derry, Alison M and Eckert, Christopher G and Fraser, Dylan J and Fussmann, Gregor F and Gonzalez, Andrew and Guichard, Frederic and Lamy, Thomas and Lane, Jeffrey and McAdam, Andrew G and Newman, Amy E M and Paccard, Antoine and Robertson, Bruce and Rolshausen, Gregor and Schulte, Patricia M and Simons, Andrew M and Vellend, Mark and Hendry, Andrew P},
    journal = {The American Naturalist},
    language = {English},
    number = {4},
    pages = {495--515},
    pmid = {31490718},
    rating = {0},
    title = {{Understanding maladaptation by uniting ecological and evolutionary perspectives}},
    volume = {194},
    year = {2019}}

@article{testestest,
    author = {Brady, Steven P and Bolnick, Daniel I and Angert, Amy L and Gonzalez, Andrew and Barrett, Rowan Douglas H. and Crispo, Erika and Derry, Alison M and Eckert, Christopher G and Fraser, Dylan J and Fussmann, Gregor F and Guichard, Frederic and Lamy, Thomas and McAdam, Andrew G and Newman, Amy E M and Paccard, Antoine and Rolshausen, Gregor and Simons, Andrew M and Hendry, Andrew P},
    journal = {Evolutionary Applications},
    number = {7},
    pages = {1229--1242},
    rating = {0},
    title = {{Causes of maladaptation}},
    volume = {12},
    year = {2019}}

\end{filecontents*}

\usepackage[round]{natbib}
\usepackage[sectionbib]{bibunits}
\defaultbibliographystyle{chicago} 
\defaultbibliography{mycitations}

\begin{document}
\bibliographyunit[\chapter]

\setcitestyle{authoryear,round,aysep={},yysep={,},notesep={ }}

This is a duDDDEEEEEE, be careful: \citep{Brady:2019fe}.
\citet{Brady:2019fe,testestest}.
\cite{Brady:2019fe}
\cite{testestest}

\tableofcontents

\bibliographystyle{chicago}
\bibliography{mycitations}

\end{document}