Latex：横向页面和纵向页面之间有空白页。为什么？

Question

我从这里将此称为横向页面（主文件)：

\begin{landscape}  
\vspace{5cm}
\chapter{XXXXX} 
\label{ch:YYYY}     
\end{landscape}
\input{./XXX/Model.tex} 

模型.tex：

\begin{landscape}  % Querformat
\begin{flushleft} % Linksbündig
\begin{minipage}{\linewidth}
\newpage
\noindent 
\begin{tikzpicture}

% Überschrift:
\begin{scope}[x=23.02cm,y=16.02cm]
\node[above right] at (0,1) {
\begin{large}
\noindent
\end{large}}; 
\end{scope}

% Hintergrundbild:
\useasboundingbox(0,0)rectangle(\linewidth,\textheight);
\node[anchor=south west] (Bild) at (0cm,0.139cm)
{\includegraphics[width=23cm,height=15.722cm]{1.png}};

\end{tikzpicture}
\end{minipage}
\end{flushleft}
\end{landscape}




    \begin{landscape}  % Querformat
    \begin{flushleft} % Linksbündig
    \begin{minipage}{\linewidth}
    \newpage
    \noindent 
    \begin{tikzpicture}

    % Überschrift:
    \begin{scope}[x=23.02cm,y=16.02cm]
    \node[above right] at (0,1) {
    \begin{large}
    \noindent

    \end{large}}; 
    \end{scope}


    \useasboundingbox(0,0)rectangle(\linewidth,\textheight);
    \node[anchor=south west] (Bild) at (0cm,0.139cm)
    {\includegraphics[width=23cm,height=15.722cm]{2.png}};

    \end{tikzpicture}
    \end{minipage}
    \end{flushleft}
    \end{landscape}

主文件：

\section{xxx}   
\includegraphics[width=0.75\linewidth]{3.png}