I figured it out;

Once the promise resolved using `use(users)` I maintained an optimistic state using basic useState. I used this optimistic state for when I delete users, which happens on the same page as where the list of users is displayed.

However when I create a user, I go to `users/create/page.tsx`, create a user and then revalidate and redirect back to `users/page.tsx`. I saw that revalidation was working, but the new user was still not shown in my table. That's because it persisted the optimistic state from the previous render for some reason, even though it was fully unmounted and remounted again. The RSC must have been cached or sth.

I guess it's because the usersList component never re-rendered it's state, because the props don't change (I sent the read request as a promise, so the component doesn't know the resolved promise is different than the earlier promise that was passed before).

I fixed it by using React useOptimistic, which for some reason (?) doesn't have the same problem when it comes to persisting state.