Nomad Rescheduling Error

While trying to redeploy one of our Nomad jobs last week, I ran into an error that I hadn't seen before.

This message greeted me after submitting the job:

I was confused. In the past 8 years of working with Nomad, I had never come across a similar error. I tried resubmitting the job again, but the same error occurred. I attempted it once more, and the same error persisted.

However, when I resubmitted a different job on the same node, there was no error at all. This only added to my confusion.

I decided to restart the Nomad daemon by running systemctl restart nomad and the error disappeared.

Problem solved. But I am still confused.