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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
let React;
let ReactFeatureFlags;
let Fragment;
let ReactNoop;
let Scheduler;
let Suspense;
let textCache;
let readText;
let resolveText;
let rejectText;
describe('ReactSuspenseWithNoopRenderer', () => {
  if (!__EXPERIMENTAL__) {
    it("empty test so Jest doesn't complain", () => {});
    return;
  }
  beforeEach(() => {
    jest.resetModules();
    ReactFeatureFlags = require('shared/ReactFeatureFlags');
    ReactFeatureFlags.debugRenderPhaseSideEffectsForStrictMode = false;
    ReactFeatureFlags.replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
    ReactFeatureFlags.flushSuspenseFallbacksInTests = false;
    React = require('react');
    Fragment = React.Fragment;
    ReactNoop = require('react-noop-renderer');