Genesys Cloud EventBridge: `conversationId` missing in `CONVERSATION_PARTICIPANT_ADDED` JSON

We’ve got the EventBridge integration live, but the detail payload for CONVERSATION_PARTICIPANT_ADDED is weird. The conversationId field is null. We need that ID to fetch participant data via the /api/v2/conversations/messaging/ endpoint in our Lambda.

Here’s the JSON:

{"detail": {"conversationId": null, "participantId": "abc-123"}}

Is this a known SDK limitation or are we missing a config flag in the webhook setup?