背面的章节标签后没有空格

Question

部分标签后没有空格：

可以看到输出结果为：

    \documentclass[10pt,twocolumn]{ICCAS2021}
    
    \usepackage{subcaption}
    
    \usepackage{hyperref}
    \usepackage{xurl}
    \usepackage{diagbox}
    
    
    \begin{document}
        
    This paper is structured as follows. 
        Section~\ref{section 2} describes the proposed method, Section~\ref{section 3} presents experimental results and discussion, and Section~\ref{section 4} concludes this work and future work.


\section{Methodology}
\label{section 2}

\section{Results and Discussion}
\label{section 3}
\section{Conclusion}\label{section 4}
    
    \end{document}