I tested it now. It’s probably related to the other plugin I am using. Seems like yours and that plugin can’t build at the same time, probably conflicting names/imports or something. So I have to build your plugin first, then make sure it isn’t rebuild when added to the other project (so make sure git status don’t find the file, therefore commit your plugin content or .gitignore it), then it works. A lot of hassell, but it seems like it’s just because of this special case of combining the plugins. Took some time to fix but it’s finally done 
You could add it to your guide as a section “If you can’t build the plugin” maybe