next-prefetcher service worker present when next/prefetch not used

[sedubois]

I don't have any import of next/prefetch in my project, and yet I see this in DevTools:

[arunoda]

Service workers a background worker runs beyond your web page's lifetime.
It seems like, you've registered a SW with a different version of the app running on this port and the server worker is still running.

But it won't do anything.

[sedubois]

OK indeed I see that the problem is only locally, the deployed version doesn't have such a service worker when next/prefetch isn't used.