This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
const updateQueue: UpdateQueue<any> = (workInProgress.updateQueue: any);
        workInProgress.memoizedState = updateQueue.baseState = derivedState;
      }
      pushCacheProvider(workInProgress, parentCache);
      
      
    } else {
      
      const nextCache = nextState.cache;
      pushCacheProvider(workInProgress, nextCache);
      if (nextCache !== prevState.cache) {
        
        propagateContextChange(workInProgress, CacheContext, renderLanes);
      }
    }
  }
  const nextChildren = workInProgress.pendingProps.children;
  reconcileChildren(current, workInProgress, nextChildren, renderLanes);
  return workInProgress.child;
}
function updateFragment(
  current: Fiber | null,
  workInProgress: Fiber,
  renderLanes: Lanes,
) {
  const nextChildren = workInProgress.pendingProps;
  reconcileChildren(current, workInProgress, nextChildren, renderLanes);
  return workInProgress.child;
}
function updateMode(