Mit dem Kernel 5.10.0-11 aus dem Security-Repo ist das dann auch wieder alles normal..

Feb 2 15:57:48 bolide dbus-daemon[701]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.103' (uid=0 pid=7092 comm="hostnamectl set-hostname bolide ")
Feb 2 15:57:48 bolide systemd[1]: Starting Hostname Service...
Feb 2 15:57:48 bolide dbus-daemon[701]: [system] Successfully activated service 'org.freedesktop.hostname1'
Feb 2 15:57:48 bolide systemd[1]: Started Hostname Service.