## 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
_create_person(team=self.team, distinct_ids=["person_1"], properties={"foo": "bar"})
        whatever_cohort: Cohort = Cohort.objects.create(
            id=113,
            team=self.team,
            groups=[{"properties": [{"type": "person", "key": "foo", "value": "bar", "operator": "exact"}]}],
            last_calculation=timezone.now(),
        )
        whatever_cohort.calculate_people_ch(pending_version=0)
        with self.settings(USE_PRECALCULATED_CH_COHORT_PEOPLE=True):  # 
            response_user_property = self.client.get(
                f"/api/projects/{self.team.id}/insights/trend/?events={json.dumps([{'id': '$pageview'}])}&properties={json.dumps([{'type':'person','key':'foo','value':'bar'}])}"
            )
            response_precalculated_cohort = self.client.get(
                f"/api/projects/{self.team.id}/insights/trend/?events={json.dumps([{'id':'$pageview'}])}&properties={json.dumps([{'type':'cohort','key':'id','value':113}])}"
            )
        self.assertEqual(response_precalculated_cohort.status_code, 200)
        response_user_property_data = response_user_property.json()
        response_precalculated_cohort_data = response_precalculated_cohort.json()
        response_user_property_data.pop("last_refresh")
        response_precalculated_cohort_data.pop("last_refresh")
        self.assertEntityResponseEqual(
            response_user_property_data["result"], response_precalculated_cohort_data["result"]
        )
    def test_insight_trends_compare(self):