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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
switch (returnFiber.tag) {
          case HostRoot: {
            const parentContainer = returnFiber.stateNode.containerInfo;
            didNotMatchHydratedContainerTextInstance(
              parentContainer,
              textInstance,
              textContent,
            );
            break;
          }
          case HostComponent: {
            const parentType = returnFiber.type;
            const parentProps = returnFiber.memoizedProps;
            const parentInstance = returnFiber.stateNode;
            didNotMatchHydratedTextInstance(
              parentType,
              parentProps,
              parentInstance,
              textInstance,
              textContent,
            );
            break;
          }
        }
      }
    }
  }
  return shouldUpdate;
}
function prepareToHydrateHostSuspenseInstance(fiber: Fiber): void {