[Tex/LaTex] Libertinus and \mathcal

fontsmath-mode

I'm using the libertinus font in order to match the math to my text (i used linux libertine). I need a \mathcal{L} symbol in my text, but i'm only getting a regular L. I looked at the documentation of the font and compiled the .tex document myself. I get a different output, however. Here is a passage using \mathcal{A} in the uploaded pdf-file:
Image of uploaded pdf

here is an image of the same passage in the document i compiled myself:
Image of self-compiled document

As you can see, there is clearly a difference.

I'm confused. I wanted to find a difference in my preamble to the documentation, but even the documentation (using the exact same .tex file) gives me different results. I have no idea how to fix this, i don't know much about font handling.
Note that this could be my only issue, so having a special treatment of \mathcal{L} would be fine (though i would love to learn more about the difference here).

Here is a MWE taken from the linked .tex file:

\documentclass{article}

\usepackage{amsmath,amsthm,trace}
\usepackage{unicode-math}
\setmainfont{Libertinus Serif}
\setsansfont{Libertinus Sans}
\setmathfont[AutoFakeBold]{Libertinus Math}

\newtheorem{thm}{Theorem}[section]
\newtheorem{lem}[thm]{Lemma}

\newcommand{\A}{\mathcal{A}}
\newcommand{\BB}{\mathcal{B}}

%    Enclose the argument in vert-bar delimiters:
\newcommand{\envert}[1]{\left\lvert#1\right\rvert}
\let\abs=\envert

\begin{document}
    \begin{lem}\label{p0201}
    Let $\A$ be an arrangement. Then
    \[ \chi (\A,t) = \sum_{\BB \subseteq \A}
    (-1)^{\abs{\BB}} t^{\dim T(\BB)}. \]
    \end{lem}
\end{document}

Best Answer

The font on CTAN seems to be faulty. You need to download the newest version from github https://github.com/khaledhosny/libertinus/blob/master/libertinusmath-regular.otf and either replace your font or move it e.g. to your current folder and load it with 

  \setmathfont{libertinusmath-regular.otf}[Path=./]
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