## Bug description

If I mark an insight as a favorite (⭐) and then refresh, the insight is no longer marked as a favorite although it is (can see it in Favorites).

<img width="390" alt="image" src="https://user-images.githubusercontent.com/30181361/182802236-9ecf0531-899c-4f25-ae86-bc233cefdc2f.png">

Note that I'm in the _Favorites_ tab and that _Bug example_ is not starred.
## Environment

- [x] PostHog Cloud
- [ ] self-hosted PostHog, version/commit: please provide

posthog/api/test/test_insight.py
"""
        Various regression tests for the serializer
        """
        # 
        response = self.client.get(
            f"/api/projects/{self.team.id}/insights/trend/?events={json.dumps([{'id': '$pageview'}])}&properties=%5B%5D&display=ActionsLineGraph"
        )
        self.assertEqual(patch_capture_exception.call_count, 0, patch_capture_exception.call_args_list)
        # 
        events = [{"id": "$pageview", "properties": [{"key": "something", "value": ["something"]}]}]
        response = self.client.get(
            f"/api/projects/{self.team.id}/insights/trend/?events={json.dumps(events)}&properties=%5B%5D&display=ActionsLineGraph"
        )
        self.assertEqual(patch_capture_exception.call_count, 0, patch_capture_exception.call_args_list)
        # 
        cohort_one_id = self._create_one_person_cohort([{"key": "prop", "value": 5, "type": "person"}])
        cohort_two_id = self._create_one_person_cohort([{"key": "prop", "value": 6, "type": "person"}])
        events = [
            {"id": "$pageview", "properties": [{"key": "something", "value": ["something"]}]},
            {"id": "$pageview"},
        ]
        response = self.client.post(
            f"/api/projects/{self.team.id}/insights/funnel/",
            {"events": events, "breakdown": [cohort_one_id, cohort_two_id], "breakdown_type": "cohort"},
        )
        self.assertEqual(response.status_code, 200)
        self.assertEqual(patch_capture_exception.call_count, 0, patch_capture_exception.call_args_list)
    def _create_one_person_cohort(self, properties: List[Dict[str, Any]]) -> int: