In OpenAM 12.0.1 navigating to Configuration -> Server & Sites -> ServerName -> Directory Configuration shows an empty list of configuration store servers.
Behind the scenes the config seems intact (present in LDAP and an export-svc-cfg).
Making changes (adding a new server) or modifying the bindDN/pool sizes doesn't cause any problems, but the list of servers will never appear in the console. I believe this is purely a 'view' issue only.
This problem occurs regardless of whether it is a new install or an upgrade from a previously working 11.0.x/12.0.0.