Oof. You may want to rethink Alpine as a desktop if you're not familiar with how to debug it. You are in for a world of shuffling back and forth haha.
Alpine was originally meant for embedded devices to have a super tiny static footprint, hence it being based on busybox. APK as a package manager coupled with using dotfiles as a configuration language is always going to leave you second guessing whether something got missed, and questions like you're asking.
I would go back through the dep chain and make sure EVERYTHING is actually installed AND configured/linked. Even on image builds I've seen APK silently miss a dep due to a resolve error and continue. It's not built to be as thorough as something like rpm or apt, and it's very easy for something to get completely missed or just not configured or linked.
Good luck!