call_person puts previous person on call temporarily

I set up a temp service, escalation policy, and schedule for use by pagerbot. I tested it, which put me on call for 5m, and it worked. Much later, I did @pagerbot get someone_else whatever, and I got a notification from pagerduty that I was going on call, and then right after, I got the going off call notification. The incident that it created did get assigned to the someone else.

Is this a known thing?