https://codesandbox.io/s/upbeat-frost-3tt25

1. Press Suspend, see "Loading..."
2. Wait five seconds, you'll see "Happy birthday" at some point 
3. You won't see it again no matter how long you wait

Expected: you'll see it every five seconds.
/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */
import type {Fiber} from './ReactFiber';
import type {ExpirationTime} from './ReactFiberExpirationTime';
import type {RootTag} from 'react-reconciler/src/ReactRootTags';
import type {TimeoutHandle, NoTimeout} from './ReactFiberHostConfig';
import type {Wakeable} from 'shared/ReactTypes';
import type {Interaction} from 'scheduler/src/Tracing';
import type {SuspenseHydrationCallbacks} from './ReactFiberSuspenseComponent';
import type {ReactPriorityLevel} from './SchedulerWithReactIntegration';
import {noTimeout} from './ReactFiberHostConfig';
import {createHostRootFiber} from './ReactFiber';
import {NoWork} from './ReactFiberExpirationTime';
import {
  enableSchedulerTracing,
  enableSuspenseCallback,