Overfull with two columns, one small box and one big box, how can I deal with the overfull without breaking the boxes?

Question

I have a twocolumn document with some sections where I use some box type of content (tcolorbox for instance)

On one of the page, I have two boxes, one small and one big. The big one is too big to fit in the first column, creating a Warning of type overfull, also breaking the first column layout in the process with some large vertical spaces.

I looked for answers by looking up overfull and got basically the gist that I should rework the boxes/the content so that the warning disappear.

But what if I can't break the boxes (the boxes of my real document would look ugly if I did) ? How do I avoid the breakout of the layout of my page ?

I have the following ME :

\documentclass[twocolumn]{article}
\XeTeXdefaultencoding utf-8
\usepackage{fontspec}
\defaultfontfeatures{Mapping=tex-text}

\usepackage{scrlayer-scrpage}
\usepackage{blindtext}

\begin{document}
\section{A section}
\subsection{B section}
\vbox{
\blindtext
}
\vbox{
\blindtext[2]
}
\end{document}

I use KOMA-script classes for my real document but the problem still exists with its two column so I am guessing it is more fundamental.

Answer 1

Like this?

\documentclass[twocolumn]{article}
\usepackage{scrlayer-scrpage}
\usepackage{blindtext}

\begin{document}
\section{A section}
\subsection{B section}
\begin{minipage}{\linewidth}
  \blindtext
\end{minipage}
\vfill
\mbox{}

\begin{minipage}{\linewidth}
\blindtext[2]
\end{minipage}

\end{document}

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