书籍封面内的脚注文本无法显示

Question

我尝试了两种不同的方法在需要标题的部分内容中添加脚注front，但都无法显示脚注文本。请问我该如何纠正这个问题？

\documentclass[trimmed=true]{bookcover}
\usepackage{csquotes}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage{keyfloat}
\usepackage{xparse}

%coverwidth=〈length〉
%coverheight=〈length〉
%spinewidth=〈length〉
%flapwidth=〈length〉
%marklength=〈length〉
%bleedwidth=〈length〉
%markthick=〈length〉
%markcolor=〈color〉
%〈10pt|11pt|12pt〉
%trimmed=〈true|false〉

\NewDocumentCommand{\booktitleA}{}{FIRST}
\NewDocumentCommand{\booktitleB}{}{SECOND}
\NewDocumentCommand{\booktitleC}{}{THIRD}
\NewDocumentCommand{\booktitleCfn}{}{precision}
\NewDocumentCommand{\booktitleD}{}{FOURTH}

\begin{document}

% One-piece background parts: <----
% bg back flap,
% bg back,
% bg spine,
% bg front,
% bg front flap >------------------
% One-piece foreground parts: <----
% back flap,
% back,
% spine,
% front,
% front flap,
% above back,
% above front,
% below back,
% below front >--------------------

\begin{bookcover}

  %\bookcovercomponent{center}{above front}{\color{blue}Remark above front} % You won't see it if [trimmed=true]
  \bookcovercomponent{center}{spine}{\rotatebox[origin=c]{90}{\bfseries\large \booktitleA~\booktitleB }}

  \bookcovercomponent{normal}{front}{

    \begin{center}
      \bfseries

    {\large \booktitleA}\\
    \vspace*{\fill}
    {\huge \booktitleB}\\
    \vspace*{\fill}
%   {\large \booktitleC\footnote{\booktitleCfn}} % TRY # 1 
    {\large \booktitleC\footnotemark[1]}
    \vspace*{\fill}\\
    \keyfig{lw=0.3,cstar={}}{example-image-a.png}
    \vspace*{\fill}
    {\huge \booktitleD}

    \end{center}
\footnotetext{\booktitleCfn} % Try # 2
  }

\end{bookcover}

\end{document}