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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
isHydrating = false;
    hydrationParentFiber = fiber;
    return;
  }
  const firstAttemptedInstance = nextInstance;
  if (!tryHydrate(fiber, nextInstance)) {
    
    
    
    nextInstance = getNextHydratableSibling(firstAttemptedInstance);
    if (!nextInstance || !tryHydrate(fiber, nextInstance)) {
      
      insertNonHydratedInstance((hydrationParentFiber: any), fiber);
      isHydrating = false;
      hydrationParentFiber = fiber;
      return;
    }
    
    
    
    
    deleteHydratableInstance(
      (hydrationParentFiber: any),
      firstAttemptedInstance,
    );
  }
  hydrationParentFiber = fiber;
  nextHydratableInstance = getFirstHydratableChild((nextInstance: any));
}
function prepareToHydrateHostInstance(