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systemd launches "systemd-machine-id-setup" in post script which in turn depends on libssl.so.1.1. However, openssl-libs is not included in systemd post requires, so sometimes when performing deployment with per-package installation, we are left without /etc/machine-id which leads to crucial problems (such as missing vmlinuz in /boot since kernel install scripts don't copy it if machine-id is missing)

I'm not sure adding a Requires(post) is going to help. openssl-libs is already among transitive dependencies of systemd; that it is sometimes not installed before systemd suggests that there was a dependency loop in the transaction that did have to be broken by rpm.

OTOH, Fedora already does it so we may as well...

Fedora patch: https://src.fedoraproject.org/rpms/systemd/c/71e781a09623e04dc1006dcba12838578595d70f

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (systemd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4469