I have updated the Crayon Syntax Highlighter to work with PHP8 and above.
While I have tagged the release as 2.8.6 I’m moving away from that version scheme.
git clone https://code.icod.de/dalu/crayon-syntax-highlighter.git
and use master branch.
Remember to visit the settings page and save your settings, especially when switching PHP versions.
To my knowledge this is the only public repository of a working Crayon Syntax Highlighter plugin, feel free to correct me.