Counting points from random exercises

[cgnieder]

\documentclass{article}
\usepackage{xsim}

\DeclareExerciseCollection{foo}

\usepackage{filecontents,lipsum}
\begin{filecontents*}{foo.tex}
\begin{exercise}[points=1]
  foo one \lipsum[4]
\end{exercise}
\begin{solution}
  foo one \lipsum[4]
\end{solution}
\begin{exercise}[points=2]
  foo two \lipsum[4]
\end{exercise}
\begin{solution}
  foo two \lipsum[4]
\end{solution}
\begin{exercise}[points=3]
  foo three \lipsum[4]
\end{exercise}
\begin{solution}
  foo three \lipsum[4]
\end{solution}
\end{filecontents*}

\begin{document}

\collectexercises{foo}
\input{foo.tex}
\collectexercisesstop{foo}

\printrandomexercises[collection=foo]{1}

% prints 6 instead of either 1, 2, or 3:
Total: \printtotalpoints

\end{document}

[ptoche]

As initially reported here: https://tex.stackexchange.com/questions/419046/xsim-incorrect-number-of-questions-and-total-of-points

This is a follow up on https://tex.stackexchange.com/questions/383207, where the xsim package is used to create a collection of questions with unique IDs and where the questions are then inserted by ID.

How can I get the correct number of points and questions when some questions are declared in the collection but not subsquently inserted in the document?

The commands \numberofquestions and \printtotalpoints correctly compute the number and points inside the collection, but I would like to have a count for the inserted questions only. In the screenshot: 1 question is inserted for 50 points, but the counter shows 2 questions for 100 points.

What am I doing wrong?

\documentclass{article}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{filecontents} % for self-contained example
\begin{filecontents}{bank.tex}
\begin{question}[ID={Q1}, points={50}, tags={difficult}]
First Question: Select one of the following solutions:
\begin{enumerate}
\item A
\item B
\item C
\item D
\item E
\end{enumerate}
\end{question}
\begin{answer}
Solution to First Question
\end{answer}

\begin{question}[ID={Q2}, points={50}, tags={bonus}]
Second Question: Select one of the following solutions:
\begin{enumerate}
\item A
\item B
\item C
\item D
\item E
\end{enumerate}
\end{question}
\begin{answer}
Solution to Second Question
\end{answer}
\end{filecontents}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\usepackage{xsim}
\usepackage[most]{tcolorbox}

\newcommand*\includeQuestion[1]{%
\XSIMexpandcode{\printexercise{question}{\GetExerciseIdForProperty{ID}{#1}}}%
}

\newcommand*\includeSolution[1]{%
\XSIMexpandcode{\printsolution{question}{\GetExerciseIdForProperty{ID}{#1}}}%
}

\DeclareExerciseEnvironmentTemplate{tcb}
{%
    \tcolorbox[breakable,
        drop shadow,
        beforeafter skip = 1\baselineskip,
        fonttitle   = \bfseries,
        fontupper = \normalsize,
        valign = top,
        colframe = \IfInsideSolutionF{green!20!white}\IfInsideSolutionT{blue!20!white},
        colback = \IfInsideSolutionF{green!3!white}\IfInsideSolutionT{blue!3!white},
        coltext = black,
        coltitle = black,
        boxrule = 1pt,
        width = \linewidth,
        left = 2mm,
        title =
        \IfInsideSolutionT{\XSIMmixedcase{\XSIMtranslate{solution}}~to~}%
        \XSIMmixedcase{\XSIMtranslate{question}}~\GetExerciseProperty{counter}%
        \IfInsideSolutionF{%  
          \IfExercisePropertySetT{tags}{%
            \textbf{~~(\ListExerciseTags{tags}{, })}}%
          \IfExercisePropertySetT{points}{%
            \hfill[\GetExerciseProperty{points}
            \IfExerciseGoalSingularTF{points}
              {\XSIMtranslate{point}}
              {\XSIMtranslate{points}}]%
          }%
        }%
    ]%
}{\endtcolorbox}

\DeclareExerciseType{question}{
    exercise-env = question,
    solution-env = answer,
    exercise-name = question, % used with headings=true
    solution-name = solution,  % used with headings=true
    exercise-template = tcb,
    solution-template = tcb
}

\DeclareExerciseCollection{myCollection}


\begin{document}

\collectexercises{myCollection}
\input{bank.tex}
\collectexercisesstop{myCollection}

\section*{Instructions}
\noindent Total number of questions: \numberofquestions. \par
\noindent Total points: \printtotalpoints.

\section*{Questions}

\includeQuestion{Q1}
\includeSolution{Q1}

%\includeQuestion{Q2}
%\includeSolution{Q2}

\end{document}