## 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
if isinstance(layouts, str):
                layouts = json.loads(layouts)
            serialized_data["layouts"] = layouts
        return Response(serialized_data)
    
    
    
    
    
    
    #
    
    
    
    
    #
    
    
    
    
    
    @extend_schema(
        request=TrendSerializer,
        methods=["POST"],
        tags=["trend"],
        operation_id="Trends",
        responses=TrendResultsSerializer,
    )
    @action(methods=["GET", "POST"], detail=False)
    def trend(self, request: request.Request, *args: Any, **kwargs: Any):