【报Bug】uni-collapse-item 页面显示undefined

示例代码：

<template>  
    <view>  
        <uni-collapse ref='reColl' accordion="true">  
            <scroll-view :scroll-into-view="scrollViewId" :style="{ height: winHeight + 'px' }" class="uni-indexed__list"  
                scroll-y="true">  
                    <uni-collapse>  
                        <uni-collapse-item @click="openIndex=index" v-for="(yearlist,index) in list" :key="index" :title="yearlist.year + '款' " :show-animation="true">  
                            <uni-list>  
                                <uni-list-item style="padding-left:5px;" v-for="(item,idx) in yearlist.data" :key="idx" :title="item.name" :show-arrow="false"  
                                @click="selected(item)"></uni-list-item>  
                            </uni-list>  
                        </uni-collapse-item>  
                    </uni-collapse>  
            </scroll-view>  
        </uni-collapse>  
    </view>  
</template>

onLoad(option) {  
            this.winHeight = uni.getSystemInfoSync().windowHeight  
            this.carimg = option.img  
            this.data.series_id = option.id  
            let obj = []  
            getbrandInfoApi({ ...this.data}).then(res => {  

                res.data.info.filter(item => {  
                    let data = item['year']  
                    let index = obj.findIndex(idx => {  
                        return (idx.year == data) ? true : false  
                    })  
                    if (-1 == index) {  
                        obj.push({ year: data, data: [{ 'name':item['name'],'full_name':item['full_name'],'group_name':item['group_name'],'id':item['id']}]})  
                    } else {  
                        obj[index].data.push({'name':item['name'],'full_name':item['full_name'],'group_name':item['group_name'],'id':item['id']})  
                    }  
                })  
                this.list = obj  
            }).catch(err => {  
                console.log(err)  
            })  
        },

操作步骤：

直接打开就不显示

预期结果：

修复bug 显示title

实际结果：

APP页面 uni-collapse-item title 显示 undefined