This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
}
      
      const nextState: OffscreenState = {
        baseLanes: NoLanes,
        cachePool: null,
      };
      workInProgress.memoizedState = nextState;
      
      const subtreeRenderLanes =
        prevState !== null ? prevState.baseLanes : renderLanes;
      pushRenderLanes(workInProgress, subtreeRenderLanes);
    }
  } else {
    
    let subtreeRenderLanes;
    if (prevState !== null) {
      
      subtreeRenderLanes = mergeLanes(prevState.baseLanes, renderLanes);
      if (enableCache) {
        
        
        
        const prevCachePool = prevState.cachePool;
        if (prevCachePool !== null) {
          spawnedCachePool = restoreSpawnedCachePool(
            workInProgress,
            prevCachePool,
          );
        }
      }