LOF and LOT in two columns with different Names in TOC, in headmark an on Page

Question

There is a TableOfContent, a ListOfFigures and a ListOfTables.

The LOF and the LOT are on one page in two columns (multicols). They should have short names as Headline ("Figures" and "Tables") In the TOC they should shown with two entries ("List Of Figures" ans "List Of "Tables"), of cause the have the same pagenumber ;-) The Headmark on their page should have the description "List of Figures and Tables"

 \documentclass[12pt,DIV=10,ngerman,headings = normal,listof = totoc,bibliography = totoc,index = totoc]{scrreprt}
\usepackage[utf8]{inputenc}
\usepackage{multicol}
\usepackage{geometry}
\setlength{\topskip}{\ht\strutbox} % behebt Warnung von geometry
\geometry{paper=a4paper,left=30mm,right=30mm,top=35mm,bottom=30mm,headheight=30mm}   
\usepackage[automark,headsepline=1pt]{scrlayer-scrpage} 
\clearpairofpagestyles 

\pagestyle{scrheadings}
\automark{chapter}
\automark*{section}


\ihead{\headmark} 
\renewcommand*{\chapterpagestyle}{scrheadings}

\begin{document} 

\addcontentsline{toc}{chapter}{Table Of Content} 
\tableofcontents{}

\newpage

\begin{multicols}{2}
    \addcontentsline{toc}{chapter}{List Of Figures} 
    \renewcommand{\listfigurename}{Figures}
    \label{Figures}
    \listoffigures{}     
    \vfill\null
    \columnbreak
    \begingroup
    \let\clearpage\relax
    \addcontentsline{toc}{chapter}{List Of Tables}
    \renewcommand{\listtablename}{Tables}
    \label{Tables}
    \listoftables{}       
    \endgroup
\end{multicols}


\chapter{Chapter}
\section{Section}
\begin{figure}[h]
\caption{figure ONE}  
\end{figure}
\begin{table}[h] 
\begin{tabular}{l} 
\end{tabular}
\caption{Table  ONE} 
\end{table}
\end{document}

Answer 1

It looks strange for me. But you can remove option listof=totoc and use option headings=optiontoheadandtoc and \deftocheading to get the desired result.

\documentclass[12pt,headings = normal,bibliography = totoc,index = totoc,
  headings=optiontoheadandtoc% <- added
]{scrreprt}
%\usepackage[utf8]{inputenc}% only needed with outdated TeX-distributions
\usepackage{multicol}
\usepackage{geometry}
%\setlength{\topskip}{\ht\strutbox} % behebt Warnung von geometry???
\geometry{paper=a4paper,left=30mm,right=30mm,top=35mm,bottom=30mm,headheight=30mm}
\usepackage[headsepline=1pt]{scrlayer-scrpage}% sets page style scrheadings automatically
\clearpairofpagestyles 
\automark{chapter}
\automark*{section}
\ihead{\headmark} 
\renewcommand*{\chapterpagestyle}{scrheadings}

\deftocheading{toc}{%
  \addchap[tocentry={Table of Contents}]{\contentsname}%
}
\deftocheading{lof}{%
  \addchap[tocentry=\listfigurename,head={List of Figures and Tables}]{Figures}%
}
\deftocheading{lot}{%
  \addchap[tocentry=\listtablename,head={List of Figures and Tables}]{Tables}%
}

\begin{document} 
\tableofcontents
\clearpage
\begin{multicols}{2}
  \listoffigures
  \vfill
  \columnbreak
  \begingroup
  \let\clearpage\relax
  \listoftables
  \vfill
  \endgroup
\end{multicols}

\chapter{Chapter}
\section{Section}
\begin{figure}[h]
\caption{figure ONE}
\end{figure}
\begin{table}[h]
\begin{tabular}{l}
\end{tabular}
\caption{Table ONE}
\end{table}
\end{document}