Could you clear your Next.js fetch cache and try again?
You can clear the cache by deleting the cache directory: .next/cache/fetch-cache.
Since you are using no-store, future requests shouldn't be added to the cache.
We will be releasing a CLI that automatically clears Prismic requests from that cache, which we will recommend calling before next dev or next build.
By the way, v7.0.0 and v6.8.0 were just released today and 2 days ago respectively. We wouldn't have expected you to already be using the latest version. 
In case you want a more detailed walkthrough of v7, check out this forum post: @prismicio/client v7 is now available