## 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/insight.py
result = self.calculate_retention(request)
        return Response(result)
    @cached_function
    def calculate_retention(self, request: request.Request) -> Dict[str, Any]:
        team = self.team
        data = {}
        if not request.GET.get("date_from"):
            data.update({"date_from": "-11d"})
        filter = RetentionFilter(data=data, request=request, team=self.team)
        base_uri = request.build_absolute_uri("/")
        result = self.retention_query_class(base_uri=base_uri).run(filter, team)
        return {"result": result, "timezone": team.timezone}
    
    
    
    
    
    
    
    @action(methods=["GET", "POST"], detail=False)
    def path(self, request: request.Request, *args: Any, **kwargs: Any) -> Response: