Btukfyl

I am writing my thesis and I am struggeling with the links in the table of content.


At the end of the first chapter I have an appendix. Then another chapter follows. To end the appendix and return to the original numbering I implemented a solution I found online (definition of an unappendix command).
The table of content looks great and the numbering is like I wanted it to be.
Unfortunately the part between makeatletter and makeatother breaks the links of section 1.1 and 1.2 and makes them point to A.1 and A.2. All other links in the table of content work as expected (see Methods2).
How can I fix the two broken links?

A minimal working example can be found below.

documentclass[a4paper,12pt]{book}

usepackage[colorlinks=false, breaklinks]{hyperref}



hypersetup{

   hypertexnames=true,

   colorlinks=true,         % false: boxed links; true: colored links

   linkcolor=black,          % color of internal links 

}



usepackage{chngcntr}



makeatletter

newcounter{savesection}

newcounter{apdxsection}

renewcommandappendix{par

  setcounter{savesection}{value{section}}%

  setcounter{section}{value{apdxsection}}%

  setcounter{subsection}{0}%

  gdefthesection{@Alphc@section}}

newcommandunappendix{par

  setcounter{apdxsection}{value{section}}%

  setcounter{section}{value{savesection}}%

  setcounter{subsection}{0}%

  gdefthesection{thechapter.arabic{section}}}

makeatother



begin{document}

setlength{parindent}{0pt}

frontmatter



newpage



addtocontents{toc}{protecthypertarget{toc}{}}

tableofcontents

markboth{}{}

cleardoublepage



thispagestyle{empty}

mainmatter

setcounter{page}{1}



chapter{chapter1 chapter1 chapter1}



section{Introduction}

text text text text text text text text text text text text text text text       text text text text text text text text text text text text text text text text text text text 



section{Methods Methods Methods Methods Methods Methods Methods Methods  Methods Methods Methods Methods Methods Methods Methods Methods }



section{Methods2 Methods2}

newpage

appendix

counterwithin{figure}{section}



renewcommand{thesection}{A.arabic{section}}

newpage

section{Part 1}

newpage



section{Part 2}

newpage



unappendix



chapter{chapter2 chapter2 chapter2}



section{Introduction}

text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text text 



end{document}