Can only visit url with trailing slash once

[sprucify]

Today I discovered that my Nuxt 3 PWA app redirects mysite.com/faq/ to mysite.com
Without a trailing slash the faq page is perfectly served.

After playing around with trailingSlash: false inside nuxt.config.ts and nginx setttings I found out that when I visit mysite.com/faq/ in incognito mode, it works once. The second time it fails.
The page is probably served out of the serviceworker?