Just to keep the list up to date, an issue has been opened there:
https://redmine.postgresql.org/issues/4296
So far, the best workaround I found is to disable the module "postgresql"
from the official appstream distribution:
[root@localhost ~]# yum -qy module enable postgresql
[root@localhost ~]# yum -q info postgresql11-server|grep ^Name
Error: No matching Packages to list
[root@localhost ~]# yum -qy module disable postgresql
[root@localhost ~]# yum -q info postgresql11-server|grep ^Name
Name : postgresql11-server
++