uni-collapse-item 用v-for循环变量，会报undifined问题

我的页面用到uni-collapse-item这个插件，目前HbuilderX-alpha版2.8.0和HbuilderX最新版
循环变量展示uni-collapse-item，v-for，手机端安卓和苹果都报undifined什么情况
以下是代码

             <uni-collapse-item   thumb="../../../static/app/fenzu_2.png" v-for="(obj,index) of newprojectList" :title="obj.parentName" :key="obj.id" v-if="obj.projectList.length>0" :open="true">  
                <view>  
                    <view class="quality_object_list_item" v-for="(objx,index1) of obj.projectList" :key="objx.id" @click="gocheck($event,objx)" :data-id="index" :data-index="index1">  
                        <view class="quality_object_head">  
                            <view class="head_box">  
                                <i class="iconfont icon-"></i>  
                            </view>  
                        </view>  
                        <view class="quality_object_name">  
                            {{objx.projectName}}  
                        </view>  
                        <view class="quality_object_school">  
                            {{objx.managerName}}  
                        </view>  
                    </view>  
                </view>  
            </uni-collapse-item>  
        </uni-collapse>```