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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
type,
        index,
        type,
      );
      return false;
    }
  }
  return true;
}
function validateSuspenseListChildren(
  children: mixed,
  revealOrder: SuspenseListRevealOrder,
) {
  if (__DEV__) {
    if (
      (revealOrder === 'forwards' || revealOrder === 'backwards') &&
      children !== undefined &&
      children !== null &&
      children !== false
    ) {
      if (Array.isArray(children)) {
        for (let i = 0; i < length; i++) {
          if (!validateSuspenseListNestedChild(children[i], i)) {
            return;
          }
        }
      } else {
        let iteratorFn = getIteratorFn(children);
        if (typeof iteratorFn === 'function') {
          const childrenIterator = iteratorFn.call(children);