When vue template is rendered, the final generated structure does not have the first layer of the template li

This is the template:

 template: '<li class="slide" :ans=word.answers_list[0].content" v-bind:ref=slide{{index} :wordId="word.wordId" :time="word.time" isClosed="word.isClosed"><p class="word-cn"><p v-html="word.question_text"></p></p></li>';

This is the page:

<ul>
 <li is="slide-card"  v-for="(k,v,index) in wrongWords" v-bind:word="k"></li>
</ul>

This is the result of page rendering:

Seek the guidance of the great God