[Vuejs]-Vuetify expansion panel body has display none style in testing environment

Ended up using the below code for panel headers and the style attribute is not added anymore to expansion panel header.

<div slot="header">
    <h3>{{acl.module_name}}</h3>
</div>

Not sure why using template is adding the style attribute in my case

<template v-slot:header>
    <div>
        <h3>{{acl.module_name}}</h3>
    </div>
</template>