nvue聊天列表倒置问题

    <list :render-reverse="true" class="bg-light position-fixed left-0 right-0" :style="chatBodyBottom" @click="clickPage">  
        <cell v-for="(item,index) in list" key="index" >  
            <free-chat-item :keep-scroll-position="true" :item="item" :index="index" ref="chatItem"  
                :pretime="index > 0 ? list[index-1].sendTime : 0" @long="long"></free-chat-item>  
        </cell>  
        <cell class="im-list-last-item" :keep-scroll-position="true" :render-reverse-position="true" ref="lastItemRef"></cell>  
    </list>  

用了list的render-reverse渲染
list总是到没有彻底到底部，总是差一行的聊天记录高度，不到底部。