What may have caused the musescore dev to assume archlinux builds in debug mode is that most arch packages nowadays are build with debug symbols to help upstream with troubleshooting.
https://archlinux.org/news/debug-packag … ebuginfod/ has details, I suggest you alert the musescore dev to that newspost .
The best way to contact the archlinux package maintainer is typically to file a bug report or feature request in the bugtracker at https://bugs.archlinux.org/
Welcome to archlinux forums
]]>How can I notify the package maintainer?
Regards,
Jonathan