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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
let parent = fiber.return;
  while (
    parent !== null &&
    parent.tag !== HostComponent &&
    parent.tag !== HostRoot &&
    parent.tag !== SuspenseComponent
  ) {
    parent = parent.return;
  }
  hydrationParentFiber = parent;
}
function popHydrationState(fiber: Fiber): boolean {
  if (!supportsHydration) {
    return false;
  }
  if (fiber !== hydrationParentFiber) {
    
    
    return false;
  }
  if (!isHydrating) {
    
    
    
    popToNextHostParent(fiber);
    isHydrating = true;
    return false;