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I am using an OpenType font that can combine symbols from two adjacent words. This works fine in LibreOffice Writer, as shown on the left in this image. The line-with-circle is drawn above the part that looks like a table. But the same font file used with LuaLatex, and the same text input, results in the mess on the right with the two parts superimposed. Do I need to enable some package or feature for LaTeX to properly interpret the instructions embedded in the font? I already am including 'fontspec'.

The font in question comes from http://musilili.net/linja-pona/ version 4.9 and the input text to generate this case is "supa+lape".

\documentclass{article}
\usepackage{fontspec}
\newfontface\tpf{linjapona49}
\begin{document}
{\tpf supa+lape}
\end{document}

SIngle characters from the same font work with no problem.

Good and bad compositing

Parallel
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    Welcome to TeX.SE. Please edit your posting to show the actual LuaLaTeX code you're using. Ideally, you'd post a compilable minimum working example, beginning with \documentclass and ending with \end{document}, that generates the issue you wish to fix. Please also state which TeX distribution you employ and when you last updated it. – Mico Feb 05 '22 at 16:02
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    Also tell us which of the several versions of the font you’re using. – Thérèse Feb 05 '22 at 16:07
  • Is your TeX installation up to date? I get correct output from your minimal example. – Thérèse Feb 05 '22 at 16:41
  • lualatex -v reports "This is LuaTeX, Version 1.10.0 (TeX Live 2019/Debian)" – Parallel Feb 05 '22 at 16:43
  • I just checked the ubuntu updates and no later luatex is in the stream. If I need later I will have to get it directly from the development site. – Parallel Feb 05 '22 at 16:48
  • I see a version 2.01 at the French SVN site though the latest prebuilt binary they offer is 1.13. – Parallel Feb 05 '22 at 16:58
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    texlive 2019 is a bit old (especially for lualatex opentype font handling which has a lot of development, obviously for pdftex things more stable) – David Carlisle Feb 05 '22 at 17:00
  • See https://tex.stackexchange.com/q/1092 The paper by egreg is very helpful. – Thérèse Feb 05 '22 at 17:07
  • If you don’t want to install TeX Live without Ububtu’s package manager, you can upload the font to an Overleaf project and use a 2021 luatex there: https://www.overleaf.com/read/qmwvbddysjmd – Thérèse Feb 05 '22 at 18:14
  • I don't mind getting a new texlive without ubuntu. I remember it was a quite large package at the time. It is best to have the latest for this sort of hting. – Parallel Feb 05 '22 at 18:53
  • WOw, those instructions are old. I will have to do some research. – Parallel Feb 05 '22 at 19:50
  • This looks promising. – Parallel Feb 05 '22 at 21:37
  • Those instructions worked. I am now at lualatex 1.13.2 (TeX Live 2021) and the compositing is now correct. – Parallel Feb 06 '22 at 03:43

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