The latest changes around JDBC_PING2 prevent the sendDiscoveryResponse() call, and due to that discovery takes a bit longer. 

The change is implemented in Keycloak, and I'll create a PR in the upstream JGroups repository.

I did the following test locally with our JdbcPing2Test that does 100 iterations.

Before the change: 63x "no physical address, 8:53 runtime

After the change: 36x "no physical address", 6:13 runtime

Keycloak issue: https://github.com/keycloak/keycloak/issues/43357

Kudos to  pruivo@redhat.com for noticing this behavior.