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LVM introduced a new config file /etc/lvm/devices/system.devices which should contain all PVs that LVM will use on RHEL 9. This behaviour is now enabled by default in LVM[1] (but it will fallback to "scan everything" if the file is not present). for more information. Blivet doesn't add newly created PVs (or PVs of existing VGs reused during the installation) to the config file (full support of this LVM feature in Blivet is planned for 9.0[2]) effectively disabling the LVM feature in 9 beta. This creates a situation where a LVM feature approved for 9 beta is disabled for all installed systems.

To avoid this, Anaconda should create and populate the system.devices config file. This can be done by  calling "vgimportdevices -a" on the installed system (in chroot) which will create create the system.devices file and add all existing LVM PVs to it. This solution was suggested by the LVM team as a simple way to make sure the LVM devices file feature is not disabled by the installer (Blivet) for 9 beta[3].

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1749513
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1983705
[3] https://bugzilla.redhat.com/show_bug.cgi?id=1984851#c14

PR with first fix attempt: https://github.com/rhinstaller/anaconda/pull/3600

anaconda-34.25.0.17-1.el9_b is present in RHEL-9.0.0-20210930.4, moving to VERIFIED.