Repro: https://codesandbox.io/s/fast-water-4i4jb

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
if (__DEV__) {
    if (isHydrating) {
      console.error(
        'We should not be hydrating here. This is a bug in React. Please file a bug.',
      );
    }
  }
}
function enterHydrationState(fiber: Fiber): boolean {