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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
} else if (
      node.tag === SuspenseListComponent &&
      
      
      node.memoizedProps.revealOrder !== undefined
    ) {
      let didSuspend = (node.effectTag & DidCapture) !== NoEffect;
      if (didSuspend) {
        return node;
      }
    } else if (node.child !== null) {
      node.child.return = node;
      node = node.child;
      continue;
    }
    if (node === row) {
      return null;
    }
    while (node.sibling === null) {
      if (node.return === null || node.return === row) {
        return null;
      }
      node = node.return;
    }
    node.sibling.return = node.return;
    node = node.sibling;
  }
  return null;
}