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Looks like you’re just missing the empty tasks array. (and the draggable-nested issue mentioned by Roy)
if you define it for each object, you allow it to be moved in.
Updated code snippet for original jsfiddle example
<script type="text/x-template" id="template-drag">
<draggable :element="'ul'" :list="tasks" class="draggable" :options="{group:{ name:'group'}}">
<template v-for="el in children" :key="el.name">
<p>{{el.name}}</p>
<element-type :attrs="el"><draggable-nested :children="el.children"/></element-type>
</template>
</draggable>
</script>
Source:stackexchange.com