CXone Reporting API v2 returns stale queue stats instead of real-time data

Trying to pull live queue occupancy via GET /api/v2/interaction/queue/stats. Passing ?interval=realtime but the response still looks like a 5-minute aggregate. The JSON payload shows agentCount but not current wait times. Is there a specific header or parameter required to force a true real-time snapshot from the CXone Reporting API?