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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
import type {Fiber} from './ReactFiber';
import type {SuspenseInstance} from './ReactFiberHostConfig';
import type {ExpirationTime} from './ReactFiberExpirationTime';
import {SuspenseComponent, SuspenseListComponent} from './ReactWorkTags';
import {NoEffect, DidCapture} from './ReactSideEffectTags';
import {
  isSuspenseInstancePending,
  isSuspenseInstanceFallback,
} from './ReactFiberHostConfig';
export type SuspenseHydrationCallbacks = {
  onHydrated?: (suspenseInstance: SuspenseInstance) => void,
  onDeleted?: (suspenseInstance: SuspenseInstance) => void,
  ...
};
export type SuspenseState = {|
  
  
  
  dehydrated: null | SuspenseInstance,
  
  
  
  
  retryTime: ExpirationTime,
|};
export type SuspenseListTailMode = 'collapsed' | 'hidden' | void;
export type SuspenseListRenderState = {|
  isBackwards: boolean,
  
  rendering: null | Fiber,