Custom footnote outside tcolorbox

Question

PROBLEM

I have a custom footnote style done with tikz, and inside tcolorboxes this footnote doesn't fit, so I tried that all footnotes inside a tcolorbox environment get out of it with Bernard solution in this question: Footnote outside theorem environment

\usepackage{etoolbox}
\BeforeBeginEnvironment{theorem}{\savenotes}
\AfterEndEnvironment{theorem}{\spewnotes}

Of course it doesn't work, probably because the custom footnote. I was wondering if it was possible to fix this bug

CODE

%%%%%%%%%%% PACKAGES %%%%%%%%%%%%%%
\documentclass[12pt]{report}
\usepackage[a4paper, lmargin=2.75cm, rmargin=2.75cm, tmargin=3cm, bmargin=3cm]{geometry} % margins
\usepackage[hidelinks, linktoc=all]{hyperref} % \href{link}{text}
\usepackage{parskip} % auto new paragraph
\setlength{\parskip}{15pt} % more parskip length
\usepackage{tikz}
\usepackage{tcolorbox}
\tcbuselibrary{skins, breakable}
%%%%%%%%%% CUSTOM FOOTNOTE WITH TIKZ %%%%%%%%%%%%%
\usepackage[hang, flushmargin]{footmisc}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\thefootnote}{[\arabic{footnote}]} % footnote config
\let\oldfootnote\footnote
\renewcommand{\footnote}[1]{\oldfootnote{;#1}} % adds space automatically
\newcommand\varfootnote[1] % varfootnote (without number)
{\bgroup\renewcommand\thefootnote{\fnsymbol{footnote}}\renewcommand\thempfootnote{\fnsymbol{mpfootnote}}\footnotetext[0]{#1}\egroup}
\renewcommand{\footnoterule}{\kern-30pt\tikz{ % custom footnote rule
    \drawline width=0.4mm--(15.4,0);
    \drawline width=0.4mm circle (1mm);
    \filldraw(0,0) circle (0.3mm);
    \drawline width=0.4mm circle (1mm);
    \filldraw(15.5,0) circle (0.3mm);
   \drawcolor=white;}} % moves the line
\addtolength{\skip\footins}{2pc plus 5pt}
%%%%%%%%%%%% CUSTOM BOX %%%%%%%%%%%
\newtcolorbox{tbox}[1]{title={\centering\large#1}, fonttitle=\bfseries, toptitle=1.5mm, bottomtitle=1.5mm, enhanced, breakable, colback=yellow, colframe=black, boxrule=1pt, arc=2mm, rounded corners, coltitle=white, coltext=black}
%%%%%%%%%% SUPPOSED FIX %%%%%%%%%%%
\usepackage{etoolbox}
\BeforeBeginEnvironment{box}{\savenotes}
\AfterEndEnvironment{box}{\spewnotes}
%%%%%%%%%% DOCUMENT %%%%%%%%%%%%
\begin{document}
\footnote{outside footnote}
\begin{tcolorbox}[enhanced, breakable, colback=yellow, colframe=black, boxrule=0pt, arc=2mm, rounded corners, coltext=black, title=\bf{COLORBOX}, coltitle=white, colbacktitle=black, toptitle=1.5mm,
  bottomtitle=1.5mm]
\varfootnote{inside footnote without number}
Random text to fill this up\footnote{inside footnote}
\end{tcolorbox}
\begin{tbox}{title}
custom box\footnote{custom box}
\end{tbox}
\end{document}

J Leon V. · Answer 1 · 2023-07-20T02:37:38.037

Just a quick workaround is to use the \linewidth to draw the tikz embellishment, and to get everything right use end_of_paragraph\\[vertical_par_spacing_longitude] command with some given spacing like \baselineskip.

RESULT:

MWE:

%%%%%%%%%%% PACKAGES %%%%%%%%%%%%%%
\documentclass[12pt]{report}
\usepackage[a4paper, lmargin=2.75cm, rmargin=2.75cm, tmargin=3cm, bmargin=3cm]{geometry} % margins
\usepackage[hidelinks, linktoc=all]{hyperref} % \href{link}{text}
\usepackage{parskip} % auto new paragraph
\setlength{\parskip}{15pt} % more parskip length
\usepackage{tikz}
\usepackage{tcolorbox}
\usepackage{lipsum}
\tcbuselibrary{skins, breakable}
%%%%%%%%%% CUSTOM FOOTNOTE WITH TIKZ %%%%%%%%%%%%%
\usepackage[hang, flushmargin]{footmisc}
\usepackage{fancyhdr}
\pagestyle{fancy}
\renewcommand{\thefootnote}{[\arabic{footnote}]} % footnote config
\let\oldfootnote\footnote
\renewcommand{\footnote}[1]{\oldfootnote{;#1}} % adds space automatically
\newcommand\varfootnote[1] % varfootnote (without number)
{\bgroup\renewcommand\thefootnote{\fnsymbol{footnote}}\renewcommand\thempfootnote{\fnsymbol{mpfootnote}}\footnotetext[0]{#1}\egroup}
\renewcommand{\footnoterule}{\kern-30pt\tikz{ % custom footnote rule
        \drawline width=0.4mm--(\linewidth,0);
        \drawline width=0.4mm circle (1mm);
        \filldraw(0,0) circle (0.3mm);
        \drawline width=0.4mm circle (1mm);
        \filldraw(\linewidth,0) circle (0.3mm);
        \drawcolor=white;}} % moves the line
\addtolength{\skip\footins}{2pc plus 5pt}
%%%%%%%%%%%% CUSTOM BOX %%%%%%%%%%%
\newtcolorbox{tbox}[1]{title={\centering\large#1}, fonttitle=\bfseries, toptitle=1.5mm, bottomtitle=1.5mm, enhanced, breakable, colback=yellow, colframe=black, boxrule=1pt, arc=2mm, rounded corners, coltitle=white, coltext=black}
%%%%%%%%%% SUPPOSED FIX %%%%%%%%%%%
\usepackage{etoolbox}
\BeforeBeginEnvironment{box}{\savenotes}
\AfterEndEnvironment{box}{\spewnotes}
%%%%%%%%%% DOCUMENT %%%%%%%%%%%%
\begin{document}
    \lipsum*[1]\[0.5\baselineskip]\footnote{\lipsum[2]}
\begin{tcolorbox}[enhanced, breakable, colback=yellow, colframe=black, boxrule=0pt, arc=2mm, rounded corners, coltext=black, title=\bf{COLORBOX}, coltitle=white, colbacktitle=black, toptitle=1.5mm,
    bottomtitle=1.5mm]
    \lipsum[2] whereas \varfootnote{inside footnote without number}
    \lipsum[3]\\[0.5\baselineskip]\footnote{inside footnote}

\end{tcolorbox}


\begin{tbox}{title}
    \lipsum[6]\\[0.5\baselineskip] \footnote{\lipsum[7]}
\end{tbox}
\lipsum[5]


\end{document}

ADDENDUM:

In a more exhaustive review, he found the solution proposed by muzimuzhi Z, in the post Tcolorbox - footnotes at end of each page, review it and give your approval to this great solution; For my part, I only removed the definition that made the decoration look very high and I was deleting the kern command, I hope it is helpful and well, sometimes it is only a matter of formulating a question correctly, otherwise the result will be 42.