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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
/**
 * 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 {ReactProviderType, ReactContext} from 'shared/ReactTypes';
import type {BlockComponent} from 'react/src/ReactBlock';
import type {LazyComponent as LazyComponentType} from 'react/src/ReactLazy';
import type {Fiber} from './ReactFiber';
import type {FiberRoot} from './ReactFiberRoot';
import type {ExpirationTime} from './ReactFiberExpirationTime';
import type {
  SuspenseState,
  SuspenseListRenderState,
  SuspenseListTailMode,
} from './ReactFiberSuspenseComponent';
import type {SuspenseContext} from './ReactFiberSuspenseContext';
import checkPropTypes from 'shared/checkPropTypes';
import {
  IndeterminateComponent,
  FunctionComponent,
  ClassComponent,
  HostRoot,
  HostComponent,
  HostText,