Keycloak Quarkus SSL - unexpected Port forwarding from 8443 to 443

when i try to run KC Quarkus on SSL-Port 8443 (or 18443 by setting https-port) by using a hostname ‘xyz’ the link of the KC-Webapp to the KC Login automatically forwards to xyz/admin and not as expected to xyz:8443/admin. Somehow the SSL-Port get lost. Seems to be a bug, or did i miss to configure something else?

my current SSL-Config:



Okay, after some research, i found out, that the hostname must contain the custom port. This is a little bit confusing to specifiy a custom port at 2 locations in the configuration, but it works now.