v-bind.sync does not pass object as props

I'm passing an object as a required prop to a component through v-bind.sync but I'm getting an error Missing required prop: "filters"

What am I missing here? It doesn't seem to be working as specified in the documentation:

v-bind.sync="doc":

This passes each property in the doc object (e.g. title) as an individual prop, then adds v-on update listeners for each one.

Here's my component which is called using <ListFilters v-bind.sync="filters" />

<template>
  <div>{{ filters }}</div>
</template>

<script>
export default {
  name: 'ListFilters',
  props: {
    filters: {
      type: Object,
      required: true
    }
  }
}
</script>

Adding a default for filters results in the component using the default instead of the parent value.