xsim printcollection liefert Aufgabe ohne Nummer

\documentclass[12pt,parskip=true,headsepline=true]{scrartcl}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%Pakete%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[utf8]{inputenc}
\usepackage[german]{babel}
\usepackage[T1]{fontenc}
\usepackage[most]{tcolorbox}
%%%%%%%%%%%%%%%%%%%%%%%%%xsim setup%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage[use-aux]{xsim}
\xsimsetup{collect}
%%%%%%%%%%%%%%%%%%%%%Aufgabenumgebung%%%%%%%%%%%%%%%%%%%%%%
\DeclareExerciseProperty{subpoints}
\DeclareExercisePropertyAlias{subpoints}{points}

\DeclareExerciseEnvironmentTemplate{klausur}
    {%
    \tcolorbox[standard jigsaw,%
    opacityback=0,%
    opacityframe=0,%
    coltitle=black,%
    breakable,%
    drop shadow,%
    beforeafter skip=.5\baselineskip,%
    title= \textbf{\XSIMmixedcase{\GetExerciseName}~\GetExerciseProperty{counter}}%
    \GetExercisePropertyT{points}{%
      \quad
      (%
        \XSIMifeqF{\GetExerciseProperty{subpoints}}{\PropertyValue}
          {$\GetExerciseProperty{subpoints} ={}$}%
        $\printgoal{\PropertyValue}$ \IfExerciseGoalSingularTF{points}{Punkt}{Punkte}% 
      )%
    }%
    ]
    }
    {\endtcolorbox}%

\DeclareExerciseType{klausuraufgabe}{%
  exercise-env = aufgabe ,%
  solution-env = loesung ,%
  exercise-name = Aufgabe ,%
  exercises-name = Aufgabenübersicht ,%
  solution-name = Lösung ,%
  solutions-name = Lösungen ,%
  exercise-template = klausur,%
  solution-template = klausur,%
  exercise-heading = \subsection*,%
  solution-heading = \subsection*%
}%
\DeclareExerciseCollection{klausur}%

%%%%%%%%%%%%%%%%%%%%%%%%%Hauptteil%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}

\activatecollection{klausur}
\collectexercises{klausur}

\begin{aufgabe}[points=1]
Erste Aufgabe.
\end{aufgabe}

\begin{aufgabe}[points=2]
Zweite Aufgabe.
\end{aufgabe}

\begin{aufgabe}[points=3]
Dritte Aufgabe.
\end{aufgabe}

%\printcollection{klausur}
\collectexercisesstop{klausur}

\printcollection{klausur}
\gradingtable

\end{document}