## Bug description

I have lost edit permissions to a [dashboard I created](https://app.posthog.com/dashboard/28987), despite still being listed as the owner of the dashboard

## Expected behavior

I should still be able to edit the dashboard

## How to reproduce

I noticed this problem after adding a new insight, but this doesn't appear to be the cause of the issue. I've duplicated the dashboard to restore access and adding a new insight didn't appear to cause the issue 

## Environment

- [x] PostHog Cloud
- [ ] self-hosted PostHog (ClickHouse-based), version/commit: _please provide_
- [ ] self-hosted PostHog (Postgres-based, legacy), version/commit: _please provide_

## Additional context

#### *Thank you* for your bug report – we love squashing them!

posthog/api/insight.py
model = Insight
        fields = [
            "id",
            "short_id",
            "name",
            "filters",
            "filters_hash",
            "order",
            "deleted",
            "dashboard",
            "dive_dashboard",
            "layouts",
            "color",
            "last_refresh",
            "refreshing",
            "result",
            "created_at",
            "created_by",
            "description",
            "updated_at",
            "tags",
            "favorited",
            "saved",
            "last_modified_at",
            "last_modified_by",
            "is_sample",
            "effective_restriction_level",
            "effective_privilege_level",
        ]
        read_only_fields = (