Journey stops reporting a separate step_started event. The same data is carried in the step_completed event under next_step_data. Update Event Streaming integrations or flows that rely on this event.

The Test button is being removed. Validate OIDC External Connections by running them through an actual journey, which exercises the same configuration end-to-end.

The user_id parameter is being deprecated in favor of claimed_user_id on the trigger action call. Both accepted during a 3-month transition window; after that user_id returns a bad request error.