\documentclass[12pt]{article}
\usepackage[paperheight=105mm,paperwidth=74mm,margin=4mm]{geometry}
\pagenumbering{gobble}
\setlength{\parindent}{0pt}
\usepackage{fontspec}
\usepackage{moresize}
\usepackage{libertinus}
\begin{document}

Italic correction (default):

\begin{center}
  (\emph{fluff})

  ¡\emph{fanciful proof}!

  [\emph{fluff}]

  \emph{fluff}\textsuperscript{n}
\end{center}

(Visibly, no bearing correction?)
\end{document}
