附录和参考文献之间的空白页

Question

首先，我的参考文献和附录之间出现了空白页，我尝试了所有常用的修复方法，例如\clearpage和\cleardoublepage，但都没有成功。其次，页眉不会显示在附录上，从代码中可以看出，页眉即使给出也不会向下延伸，页眉行横跨页面顶部，但没有文本。

%Document style
\documentclass[a4paper, 12pt, oneside]{book}

%Packages used to format document
\usepackage[a4paper,top=40mm, bottom=40mm, left=40mm, right=30mm]{geometry}
\usepackage[english]{babel}
\usepackage{verbatim}
\usepackage{vector} 
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{titlesec}
\usepackage{nameref}
\usepackage{fancyhdr}
\usepackage[toc,page]{appendix}
\usepackage{biblatex}
\usepackage{gensymb}
\usepackage{xcolor,colortbl}
\usepackage{mathtools}
\usepackage{enumitem}
\usepackage{etoolbox}
\usepackage{subcaption}
\usepackage{pdfpages}

\begin{document}

%Preambles goes here

\setcounter{page}{1}
\pagenumbering{arabic}
\let\cleardoublepage\clearpage
\pagestyle{fancyplain}  
\fancyhead[LE,RO]{\slshape \leftmark}   \fancyhead[LE,RO]{\slshape \rightmark}
\fancyhead[LO,RE]{}                    
\fancyfoot[C]{\thepage} 

\chapter{Discussion/Comparison}

\chapter{Conclusion}

%% ----------------------------------------------------------------

\newpage
\renewcommand\bibname{References/Bibliography}
\begin{thebibliography}{99}
\addcontentsline{toc}{chapter}{References/Bibliography}
\addtocontents{toc}{\vspace{0.6em}}  

\section*{References}

\section*{Bibliography}

\end{thebibliography}

%% ----------------------------------------------------------------

\begin{appendices}

\topskip0pt
\vspace*{\fill}

\section*{\\Appendix A - Design Work Sheets} \label{App:AppendixA}
\addcontentsline{toc}{section}{Appendix A - Design Work Sheets}
\addtocontents{toc}{\vspace{0.6em}} 

\vspace*{\fill}

\includepdf[pages={1}]{Aggregate-work-sheet-results.pdf}

\includepdf[pages={1}]{cube-design-sheet.pdf}

\includepdf[pages={1}]{cylinder-design-sheet.pdf}

\topskip0pt
\vspace*{\fill}

\section*{\\Appendix B - Strength Relationship} \label{App:AppendixB}
\addcontentsline{toc}{section}{Appendix B - Strength Relationship}
\addtocontents{toc}{\vspace{0.6em}} 


The following graphs represent the cylinder/cube strength relationship ratio for all curing methods separately.

\begin{figure}[!h]
\centering
\includegraphics[scale=1.1]{ratio1.jpg}
\caption{Cylinder/Cube strength relationship ratio for sample cured at -22$\degree$C}
\label{fig:fig8.1}
\end{figure}

\vspace*{\fill}

\end{appendices}

%% ----------------------------------------------------------------

\end{document}