Scan of auto-provisioned node does not pick up nodelabel

I have the discovery range set to scan 172.20.1.1 through 172.20.1.50. We added a server called "bastion" at 172.20.1.40.

From the opennms server:

1. host 172.20.1.40
   40.1.20.172.in-addr.arpa domain name pointer bastion.internal.opennms.com.

I know that reverse DNS is working. However, the nodelabel still shows up as "172.20.1.40" despite rescans.