Conversational AI API 400 on Bulk Intent Sync

So I’m seeing a very odd bug with the Conversational AI API.

POST /api/v2/analytics/conversations/ai/intents returns 400 Bad Request when syncing bulk intent updates across our multi-org AppFoundry deployment. The payload structure matches the schema exactly.

Environment: Node.js SDK v4.2.1, OAuth2 Service Account with conversational-ai:write scope. This happens consistently on the 15th org in the batch.

Any known limits on concurrent intent definitions per second?