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.
NormalPriority,
  runWithPriority,
  getCurrentPriorityLevel,
} from './SchedulerWithReactIntegration';
import {getIsHydrating} from './ReactFiberHydrationContext';
import {
  makeClientId,
  makeClientIdInDEV,
  makeOpaqueHydratingObject,
} from './ReactFiberHostConfig';
import {
  getLastPendingExpirationTime,
  getWorkInProgressVersion,
  markSourceAsDirty,
  setPendingExpirationTime,
  setWorkInProgressVersion,
  warnAboutMultipleRenderersDEV,
} from './ReactMutableSource';
import {getRootHostContainer} from './ReactFiberHostContext';
import {getIsRendering} from './ReactCurrentFiber';
const {ReactCurrentDispatcher, ReactCurrentBatchConfig} = ReactSharedInternals;
export type Dispatcher = {|
  readContext<T>(
    context: ReactContext<T>,
    observedBits: void | number | boolean,
  ): T,
  useState<S>(initialState: (() => S) | S): [S, Dispatch<BasicStateAction<S>>],
  useReducer<S, I, A>(
    reducer: (S, A) => S,
    initialArg: I,