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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
debugRenderPhaseSideEffectsForStrictMode,
  disableLegacyContext,
  disableModulePatternComponents,
  enableProfilerTimer,
  enableSchedulerTracing,
  enableSuspenseServerRenderer,
  enableFundamentalAPI,
  warnAboutDefaultPropsOnFunctionComponents,
  enableScopeAPI,
  enableBlocksAPI,
} from 'shared/ReactFeatureFlags';
import invariant from 'shared/invariant';
import shallowEqual from 'shared/shallowEqual';
import getComponentName from 'shared/getComponentName';
import ReactStrictModeWarnings from './ReactStrictModeWarnings';
import {REACT_LAZY_TYPE, getIteratorFn} from 'shared/ReactSymbols';
import {
  getCurrentFiberOwnerNameInDevOrNull,
  setIsRendering,
} from './ReactCurrentFiber';
import {startWorkTimer, cancelWorkTimer} from './ReactDebugFiberPerf';
import {
  resolveFunctionForHotReloading,
  resolveForwardRefForHotReloading,
  resolveClassForHotReloading,
} from './ReactFiberHotReloading';
import {
  mountChildFibers,
  reconcileChildFibers,
  cloneChildFibers,