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% https://tex.stackexchange.com/q/370642/
\documentclass[a4paper,12pt]{article}
\usepackage{xsim}

\DeclareExerciseEnvironmentTemplate{simple}
  {\par\noindent\textbf{\GetExerciseProperty{counter}}. }
  {\par}
\xsimsetup{exercise/template=simple}

\begin{document}

\begin{exercise}\label{eq1}
  Let $X$ be such that\dots
\end{exercise}

\begin{exercise}
  In this exercise consider $Y=2$ \dots
\end{exercise}

\begin{exercise}
  Consider $X$ as in exercise~\ref{eq1} (I would like to see the issue
  number~1)
\end{exercise}

\end{document}