Thanks for posting to us. I've checked this subject with my repository and project, I can not reproduce this issue. I'd be happy to troubleshoot this. For this, can you please send me the github repo and the url of your repository? If you do not want to send it publicly, you can send me a private message.
Slices themselves are something that exists outside of Slicemachine, also the current Prismic Nuxt starters don't use Slicemachine (we plan to change that very soon).
Slicemachine is a tool for developing and managing Components/Slices and has some extra features like the route resolver, but this project is in BETA. It can be activated on older repositories and/or set-up automatically using the Prismic CLI.