I've been having trouble with the author-date style for biblatex-chicago, used with the option "csmdate=both". I use this option to provide "origyear" for some sources, but not for all. The problem seems to occur when I have 2 sources with identical authors and dates but no origdates. The following explains the problem.
I've added 2 references with identical dates and authors, but different titles and so on. When I cite them, biblatex-chicago does not differentiate between them. Where I would expect "Test 1935a" and "Test 1935b" I get two "Test 1935" but two separate entries in the reference list.
Any help is greatly appreciated.
Minimal working example:
\documentclass[utf8,12pt,letterpaper]{article}
\usepackage{setspace}
\usepackage[fallback]{xeCJK}
\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX}
\newcommand{\mainfont}[0]{CMU Serif Roman}
\newcommand{\mainfontitalics}[0]{CMU Serif Italic}
\newcommand{\mainfontCJK}[0]{HAN NOM A}
\setmainfont[Ligatures={Common,TeX},Numbers={OldStyle},Contextuals=NoAlternate]{\mainfont}
\setCJKmainfont[Scale=0.9]{\mainfontCJK}
\setCJKfallbackfamilyfont{\CJKrmdefault}[Scale=0.9]{NanumMyeongjo}
\XeTeXlinebreaklocale "zh"
\XeTeXlinebreakskip = 0pt plus 1pt
\usepackage[authordate,strict,cmsdate=both,isbn=false,backend=biber,bibencoding=utf8,hyperref=true,annotation]{biblatex-chicago}
\title{}
\author{}
\date{}
\begin{document}
\maketitle
\cite{Test1}
\cite{Test2}
\printbibliography
\end{document}
Citing the following references:
@article{Test1,
author = {Test, T.},
title = {Random Title of Article One},
journal = {Journal},
volume = {20},
number = {3},
year = {1935},
pages = {1--46}
}
@article{Test2,
author = {Test, T.},
title = {Random Title of Article Two},
journal = {Journal},
volume = {20},
number = {4},
year = {1935},
pages = {50--70}
}
Replacing the "year" field with "date" makes no difference.