## The problem
Issue growthbook/growthbook#971 (closed, 12 comments): Summary If in out self-hosted GrowthBook instance (latest docker image) we experienced a bug in the API feature endpoint. If you add/remove a variant (string value) the API response is not update. But if you change other settings like "default value", then it API response reflects the right amount of variants. Expected Behavior API endpoint reflects the current state of the configuration after each kind of changes.
## The fix
The GrowthBook API feature endpoint can lag after adding or removing variants because the feature payload is expensive to generate, so it's generated and cached in Mongo whenever a feature changes. In eventually consistent setups the cache can be stale. The maintainer's guidance: the only really safe setup is preferring reads from primaries, since there can be 200ms replication spikes. If your self-hosted GrowthBook API returns stale feature flags after edits, look at your Mongo read preference first.
## Notes
Thread: https://github.com/growthbook/growthbook/issues/971. Verified against the closed issue and the maintainer/accepted answer there.