Using format/list in latex acro package

I am working with lower case acronyms in latex and want them to be printed with a leading uppercase letter in the acronym list. I utilize the acro package.

Reproducable code:

\documentclass{article}
\usepackage{acro}
\usepackage{mfirstuc}

% Custom format to capitalize the first letter of each word
\newcommand{\aclistformat}[1]{\capitalisewords{#1}}

\acsetup{
    list/display = all, % Only list the referenced acronyms
    format/list = \aclistformat % Apply \capitalisewords indirectly (This does not work)
}

% Define acronyms
\DeclareAcronym{acro1}{
    short = short,
    long  = really long lowercase name
}

\begin{document}
    
    \aclistformat{test}  % This works fine

    \printacronyms
    
\end{document}

Resultant rendering:

I utilize mfirstuc to uppercase the first letter. This works fine as shown with Test. However, the acronym long name is not formatted as intended. Does anyone know why?