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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
fiber: Fiber,
  rootContainerInstance: Container,
  hostContext: HostContext,
): boolean {
  if (!supportsHydration) {
    invariant(
      false,
      'Expected prepareToHydrateHostInstance() to never be called. ' +
        'This error is likely caused by a bug in React. Please file an issue.',
    );
  }
  const instance: Instance = fiber.stateNode;
  const updatePayload = hydrateInstance(
    instance,
    fiber.type,
    fiber.memoizedProps,
    rootContainerInstance,
    hostContext,
    fiber,
  );
  
  fiber.updateQueue = (updatePayload: any);
  
  
  if (updatePayload !== null) {
    return true;
  }
  return false;
}
function prepareToHydrateHostTextInstance(fiber: Fiber): boolean {