Sandbox: https://codesandbox.io/s/cranky-kapitsa-op3jh

Repro: type "a" and then after a second "b"

Expected: Eventually you'll see "ab" in all fields. Pending "..." indicator goes away.

Actual: You'll keep seeing "a" in low pri field. Pending "..." indicator is stuck.
const update: Update<S, A> = {
    expirationTime,
    suspenseConfig,
    action,
    eagerReducer: null,
    eagerState: null,
    next: (null: any),
  };
  if (__DEV__) {
    update.priority = getCurrentPriorityLevel();
  }
   Append the update to the end of the list.
  const pending = queue.pending;
  if (pending === null) {
    
    update.next = update;
  } else {
    update.next = pending.next;
    pending.next = update;
  }
  queue.pending = update;
  const alternate = fiber.alternate;
  if (
    fiber === currentlyRenderingFiber ||
    (alternate !== null && alternate === currentlyRenderingFiber)
  ) {
    
    
    
    didScheduleRenderPhaseUpdate = true;