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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
if (!supportsHydration) {
    invariant(
      false,
      'Expected prepareToHydrateHostTextInstance() to never be called. ' +
        'This error is likely caused by a bug in React. Please file an issue.',
    );
  }
  const textInstance: TextInstance = fiber.stateNode;
  const textContent: string = fiber.memoizedProps;
  const shouldUpdate = hydrateTextInstance(textInstance, textContent, fiber);
  if (__DEV__) {
    if (shouldUpdate) {
      
      
      const returnFiber = hydrationParentFiber;
      if (returnFiber !== null) {