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For dbus bug 1941642 I have taken a series of package changes from Fedora, including updates to systemd preset handling, so that upgrades from RHEL8 to RHEL9 should work as expected. It turns out that I missed the fact that redhat-release in RHEL8.5 does not have the presets for dbus enabled by default. The change would be quite straightforward - adding:

# DBus needed by Anaconda
enable dbus.socket
enable dbus-daemon.service`

to 90-default.preset should do it. The RHEL9 branches have dbus-daemon.service replaced by dbus-broker.service.

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 (redhat-release 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-2021:4352