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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
setIsRendering(true);
    nextChildren = renderWithHooks(
      current,
      workInProgress,
      Component,
      nextProps,
      context,
      renderExpirationTime,
    );
    if (
      debugRenderPhaseSideEffectsForStrictMode &&
      workInProgress.mode & StrictMode
    ) {
      nextChildren = renderWithHooks(
        current,
        workInProgress,
        Component,
        nextProps,
        context,
        renderExpirationTime,
      );
    }
    setIsRendering(false);
  } else {
    nextChildren = renderWithHooks(
      current,
      workInProgress,
      Component,
      nextProps,
      context,