https://codesandbox.io/s/upbeat-frost-3tt25

1. Press Suspend, see "Loading..."
2. Wait five seconds, you'll see "Happy birthday" at some point 
3. You won't see it again no matter how long you wait

Expected: you'll see it every five seconds.
return (
        <Suspense fallback={<Text text="Loading" />}>
          <SuspenseList revealOrder="together">
            <Suspense
              unstable_avoidThisFallback={true}
              fallback={<Text text="Loading A" />}>
              <A />
            </Suspense>
            {showMore ? (
              <>
                <Suspense
                  unstable_avoidThisFallback={true}
                  fallback={<Text text="Loading B" />}>
                  <B />
                </Suspense>
                <Suspense
                  unstable_avoidThisFallback={true}
                  fallback={<Text text="Loading C" />}>
                  <C />
                </Suspense>