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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
didWarnAboutTailOptions[Mode] = true;
        console.error(
          '"%s" is not a supported value for  on <SuspenseList />. ' +
            'Did you mean "collapsed" or "hidden"?',
          Mode,
        );
      } else if (revealOrder !== 'forwards' && revealOrder !== 'backwards') {
        didWarnAboutTailOptions[Mode] = true;
        console.error(
          '<SuspenseList ="%s" /> is only valid if revealOrder is ' +
            '"forwards" or "backwards". ' +
            'Did you mean to specify revealOrder="forwards"?',
          Mode,
        );
      }
    }
  }
}
function validateSuspenseListNestedChild(childSlot: mixed, index: number) {
  if (__DEV__) {
    let isArray = Array.isArray(childSlot);
    let isIterable = !isArray && typeof getIteratorFn(childSlot) === 'function';
    if (isArray || isIterable) {
      let type = isArray ? 'array' : 'iterable';
      console.error(
        'A nested %s was passed to row #%s in <SuspenseList />. Wrap it in ' +
          'an additional SuspenseList to configure its revealOrder: ' +
          '<SuspenseList revealOrder=...> ... ' +
          '<SuspenseList revealOrder=...>{%s}</SuspenseList> ... ' +
          '</SuspenseList>',