## 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
import json
from functools import lru_cache
from typing import Any, Dict, List, Optional, Type
import structlog
from django.db.models import Count, OuterRef, QuerySet, Subquery
from django.db.models.query_utils import Q
from django.http import HttpResponse
from django.utils.text import slugify
from django.utils.timezone import now
from django_filters.rest_framework import DjangoFilterBackend
from drf_spectacular.utils import OpenApiResponse
from rest_framework import exceptions, request, serializers, status, viewsets
from rest_framework.decorators import action
from rest_framework.exceptions import PermissionDenied
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from rest_framework.settings import api_settings
from rest_framework_csv import renderers as csvrenderers
from sentry_sdk import capture_exception
from posthog.api.documentation import extend_schema
from posthog.api.forbid_destroy_model import ForbidDestroyModel
from posthog.api.insight_serializers import (
    FunnelSerializer,
    FunnelStepsResultsSerializer,
    TrendResultsSerializer,
    TrendSerializer,
)
from posthog.api.routing import StructuredViewSetMixin
from posthog.api.shared import UserBasicSerializer
from posthog.api.tagged_item import TaggedItemSerializerMixin, TaggedItemViewSetMixin