I have been using a keylayout for many years, Russian-zh.keylayout.xml - it has been installed on my macbook since at least 2020. I had upgraded to every version since then, including Sonoma, and it has been working just fine.
I just did a clean install of Sonoma, and now the keylaout is not working. I have copied it to /Library/Keyboard Layouts, but it is not showing up under the list of languages when I try to add it in the keyboard settings. Please help.