Citealias 不遵循相同的括号规则

Question

我试图引用一个组织，但该命令的\citepalias作用不一样\citep，它会删除括号。

%!TEX program = xelatex
\begin{filecontents}{mybib.bib}
@book{fao1990,
    author = {{Food and Agriculture Organization}},
    title = {FAO soils bulletin},
    publisher = {FAO},
    year = {1990}  
}
\end{filecontents}
\documentclass[a4paper,11pt,authoryear]{article}
\usepackage{natbib}
\usepackage[colorlinks, hidelinks, colorlinks, linktocpage=false, pagebackref=true, breaklinks=false]{hyperref}
 \hypersetup{%
    pdfborder = {0 0 0},
    colorlinks,
    citecolor=blue,
    filecolor=Darkgreen,
    linkcolor=blue,
    urlcolor=BlueViolet%cyan!50!black!90
}
\usepackage[T1]{fontenc}
\usepackage{xurl}
\bibliographystyle{apa}
\begin{document}
\defcitealias{fao1990}{FAO, 1990} 
\citepalias{fao1990}
\bibliography{mybib}
\end{document}