Adding footnote to the table leads to the error: ! Extra }, or forgotten endgroup

By making tables I am using packages siunitx, nicematrix and makecell. These three packages applied simultaneously seems to be sufficient for solving my problems with tables – like this one. I am using siunitx package, not dcolumn package, because the last one gives not satisfying placement of numbers.
I met the problem with placing the table note. The note mark has to be placed in the cell of the middle column. While I am using S-type column within NiceTabular environment I got the error:

! Extra }, or forgotten endgroup.
<template> ...z@ plus.5fillrelax egroup egroup 
                                                  begingroup [email protected] CT@...
l.23 ...tal & 160tabularnote{My footnote text.} &
                                                   100,0\

How to solve this problem? It resembles this one (in this topic probably one of @moewe’s comments leads to the solution, nevertheless I can’t cope with it).
Code:

documentclass[table]{standalone}
usepackage{siunitx}
usepackage{makecell}
usepackage{nicematrix}
usepackage{enumitem}

renewcommand{theadfont}{footnotesizebfseries}
sisetup{output-decimal-marker={,}}

begin{document}
{footnotesize
    begin{NiceTabular}[hvlines,code-before=rowcolor{gray!50}{1-1}]{
        l
        S[table-format=3,zero-decimal-to-integer,table-space-text-post=textsuperscript{a}]
        S[table-format=3.1]
    }
        {thead{Side-heading\description}} &
        {thead{First column\with data\description}} &
        {thead{Second column\with data\description}}\
        Good & 120, & 41,5\
        Bad & 140, & 58,5\
        Total & 260,tabularnote{My footnote text.} & 100,0\
    end{NiceTabular}
}
end{document}