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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
const  = returnFiber.Effect;
    if ( !== null) {
      .nextEffect = current;
      returnFiber.Effect = current;
    } else {
      returnFiber.firstEffect = returnFiber.Effect = current;
    }
    current.nextEffect = null;
    current.effectTag = Deletion;
    newWorkInProgress.effectTag |= Placement;
     
    return newWorkInProgress;
  } else {
    throw new Error(
      'Did not expect this call in production. ' +
        'This is a bug in React. Please file an issue.',
    );
  }
}
function beginWork(
  current: Fiber | null,
  workInProgress: Fiber,
  renderExpirationTime: ExpirationTime,
): Fiber | null {
  const updateExpirationTime = workInProgress.expirationTime;
  if (__DEV__) {
    if (workInProgress._debugNeedsRemount && current !== null) {