This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
const unresolvedProps = workInProgress.pendingProps;
      const resolvedProps =
        workInProgress.elementType === type
          ? unresolvedProps
          : resolveDefaultProps(type, unresolvedProps);
      return updateForwardRef(
        current,
        workInProgress,
        type,
        resolvedProps,
        renderLanes,
      );
    }
    case Fragment:
      return updateFragment(current, workInProgress, renderLanes);
    case Mode:
      return updateMode(current, workInProgress, renderLanes);
    case Profiler:
      return updateProfiler(current, workInProgress, renderLanes);
    case ContextProvider:
      return updateContextProvider(current, workInProgress, renderLanes);
    case ContextConsumer:
      return updateContextConsumer(current, workInProgress, renderLanes);
    case MemoComponent: {
      const type = workInProgress.type;
      const unresolvedProps = workInProgress.pendingProps;
      
      let resolvedProps = resolveDefaultProps(type, unresolvedProps);
      if (__DEV__) {
        if (workInProgress.type !== workInProgress.elementType) {