It seems to have broken with the release of filesystem 2021.12.07, which
incorporates this upstream change[1] in [2]. Please also see the
upstream issue[3].

I'm not sure why we used ansible_fqdn in the first place as
inventory_hostname should be preferred (as we define it ourselves).

[1] https://github.com/systemd/systemd/commit/ce266330fc3bd6767451ac3400336cd9acebe9c1
[2] archlinux/packaging/packages/filesystem@fc84245e
[3] https://github.com/systemd/systemd/issues/20358