KDE Plasma Desktop has been rebuilt on RHEL 8.5.  The rebuilt KDE packages have been pushed to epel-testing.
To test and/or use these packages do
  dnf --enablerepo=epel-testing update

Note1:  This hasn't made it out to all the mirrors yet.  I don't know how long that takes, best bet it to try tomorrow.

Note2: To get these into regular epel8, please give karma on their bodhi pages
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-8ecda13ade
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-233b6d1f6f
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-616c07a91d

Note3: There are two known packages that will not install/update right now
* k3b
-- This requires cdrskin which will be in epel-testing tomorrow.
-- https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2021-11dab2f583
* kde-gtk-config
-- This package snuck in on accident.  It shouldn't affect your updates.
-- This requires breeze-gtk, which is still being worked on to get it to work on epel8


Troy Dawson


On Thu, Nov 11, 2021 at 3:19 PM Troy Dawson <tdawson@redhat.com> wrote:
The qt5 libraries in RHEL 8.5 are at a higher version than they were in RHEL 8.4.
This is causing RHEL 8 machines that have the KDE Plasma Desktop unable to do an update due to qt5 version dependencies.

A rebuild of the KDE Plasma Desktop in EPEL8 is currently underway.
It usually takes 3-4 days for all the packages to be rebuilt, as long as the builders co-operate.
We expect the packages to be in epel8-testing by Monday, November 15.

Thank you for your patience.
Troy Dawson