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\usepackage{selinput}
\SelectInputMappings{adieresis={ä},germandbls={ß}}

\documentclass[a4paper,oneside]{scrreprt}

\usepackage{selinput}
	\SelectInputMappings{adieresis={ä},germandbls={ß}}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage[ngerman]{babel}
\usepackage[babel,german=quotes]{csquotes}
\usepackage[only-used=false]{acro}
	\acsetup{
		list-style=longtable,
		list-short-format ={\bfseries}
		}
		\ExplSyntaxOn

 \cs_undefine:N\__acro_declare_long:nn
 \acro_declare_property:nnn {long} {long}
  {
    \acro_for_endings_do:n
      { \prop_put:cnn {l__acro_long_##1_form_prop} {#1} { \c_false_bool } }
    \prop_put:NnV \l__acro_long_indefinite_prop
      {#1}
      \l__acro_default_indefinite_tl
    \acro_for_endings_do:n
      {
       \bool_if_exist:cTF {l__acro_#1_long-##1_set_bool}
        {
          \bool_if:cF {l__acro_#1_long-##1_set_bool}
          {
           \prop_put:cnv {l__acro_long_##1_prop} {#1} {l__acro_default_long_##1_tl}
          }
        }
        {
         \prop_put:cnv {l__acro_long_##1_prop} {#1} {l__acro_default_long_##1_tl}
        }
      }
  }

\ExplSyntaxOff

\DeclareAcronym{MaßstG}{
  short = MastG,
  long = {Gesetz über verfassungskonkretisierende allgemeine Maßstäbe}
}

\begin{document}
\printacronyms
\end{document}

\DeclareAcronym{MaßstG}