hostname change not reflected in early boot process

Issue

• Although I changed the hostname from testhost to rh89-01, the old hostname still appears in the early boot process. By checking journalctl -xb command, the new hostname appears only after Switching root entry like below:

Aug 20 16:29:50 testhost systemd[1]: Starting Switch Root...
-- Subject: Unit initrd-switch-root.service has begun start-up
-- Defined-By: systemd
-- Support: https://access.redhat.com/support
-- 
-- Unit initrd-switch-root.service has begun starting up.
Aug 20 16:29:50 testhost systemd[1]: Switching root.
Aug 20 16:29:50 testhost systemd-journald[225]: Journal stopped
-- Subject: The journal has been stopped
-- Defined-By: systemd
-- Support: https://access.redhat.com/support
-- 
-- The system journal process has shut down and closed all currently
-- active journal files.
Aug 20 16:29:52 rh89-01 kernel: printk: systemd: 16 output lines suppressed due to ratelimiting
Aug 20 16:29:52 rh89-01 kernel: audit: type=1404 audit(1724135390.503:2): enforcing=1 old_enforcing=0 auid=4294967295 ses=4294967295 enabled>
Aug 20 16:29:52 rh89-01 kernel: SELinux:  policy capability network_peer_controls=1
Aug 20 16:29:52 rh89-01 kernel: SELinux:  policy capability open_perms=1
Aug 20 16:29:52 rh89-01 kernel: SELinux:  policy capability extended_socket_class=1
Aug 20 16:29:52 rh89-01 kernel: SELinux:  policy capability always_check_network=0
Aug 20 16:29:52 rh89-01 kernel: SELinux:  policy capability cgroup_seclabel=1
Aug 20 16:29:52 rh89-01 kernel: SELinux:  policy capability nnp_nosuid_transition=1