Directory display out of page after reconfiguration by \titlecontents (paging failure)

[FaterYU]

The error is obviously as shown:

My part of .cls

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{xxxx}[2025/04/01 v1.0.0 xxxx]
\LoadClass[a4paper,12pt]{report}

\renewcommand{\contentsname}{\hfill\bfseries\Large \zihao{-2} \hei \bfseries 目\quad 录\hfill}   
\renewcommand{\cftaftertoctitle}{\hfill}

\titlecontents{chapter}[0pt]
  {\zihao{-4} \song}
  {}
  {} 
  {\titlerule*[0.5pc]{.}\contentspage}

\titlecontents{section}[1.5em]
  {\zihao{-4} \song}
  {\thecontentslabel \hspace{1em}}
  {1em} 
  {\titlerule*[0.5pc]{.}\contentspage} 

\titlecontents{subsection}[3.5em
  {\zihao{-4} \song}
  {\thecontentslabel \hspace{1em}} 
  {}
  {\titlerule*[0.5pc]{.}\contentspage}
  % [\addvspace{0pt}]

\newcommand{\toc}{
  \clearpage
  \begingroup
  \singlespacing
  \setstretch{1.25}
  \tableofcontents
  \endgroup
  \clearpage
  \setcounter{page}{1}
  \pagenumbering{arabic}
  \setcounter{chapter}{0}
}

My main.tex:

\documentclass{xxxx}

\begin{document}
    \maketitle

    \begin{abstracten}
    \end{abstracten}

    \begin{abstractzh}
    \end{abstractzh}

    \toc

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \chapter{MAIN BODY}
    \section{Figures}
    \subsection{Example A}
    \section{Tables}
    \subsection{Example A}
    \section{Equations}
    \subsection{Example A}
    \subsection{Example B}
    \section{Citation}
    \subsection{Example A}
    \reference{reference}

    \appendix
    \section{Appendix A}
    \section{Appendix B}
    \section{Appendix C}

    \acknowledgements
\end{document}

Magically, when I delete one of \titlecontents{chapter}, \titlecontents{section}, \titlecontents{subsection}, normal page-changing occurs. But I need to reconfigure both of them.