fix: v-if nested in a v-for template tag

[RaduRaileanu]

the fix permits nesting an element with a v-if attribute inside a template tag with a v-for attribute like so:

<template v-for="item in ['foo', 'bar', 'buzz']">
    <p v-if="item.startsWith('b')">{{ item }} </p>
</template>

[volkandkaya]

Ran into this issue multiple times. I thought it was due to using reactive but clearly not.

[BigBlueHat]

This seems related to #219

Curious if it'll ever be merged.