Configuration:

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Operating System: Arch Linux
KDE Plasma Version: 5.19.2
KDE Frameworks Version: 5.71.0
Qt Version: 5.15.0
Kernel Version: 5.4.49-1-lts
OS Type: 64-bit
Processors: 2 × Intel® Pentium® CPU G3258 @ 3.20GHz
Memory: 15.3 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics

System shuts down successfully, but not without error, the noticeable one being /home does not unmount on shutdown. Sddm crashing may be preventing orderly process termination.

journalctl -b -1 output:

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Jun 27 08:32:18 archmain systemd-logind[456]: System is powering down.
Jun 27 08:32:18 archmain systemd[1]: Stopping Session 2 of user lpc123.
Jun 27 08:32:18 archmain systemd[1]: Stopping Session c2 of user sddm.
Jun 27 08:32:18 archmain systemd[1]: Removed slice system-getty.slice.
Jun 27 08:32:18 archmain systemd[1]: Removed slice system-modprobe.slice.
Jun 27 08:32:18 archmain systemd[1]: Stopped target Bluetooth.
Jun 27 08:32:18 archmain ntpd[484]: ntpd exiting on signal 15 (Terminated)
Jun 27 08:32:18 archmain systemd[1]: Stopped target Graphical Interface.
Jun 27 08:32:18 archmain ntpd[484]: 196.10.54.57 local addr 192.168.1.2 -> <null>
Jun 27 08:32:18 archmain systemd[1]: Stopped target Multi-User System.
Jun 27 08:32:18 archmain ntpd[484]: 116.203.149.9 local addr 192.168.1.2 -> <null>
Jun 27 08:32:18 archmain systemd[1]: Stopped target Login Prompts.
Jun 27 08:32:18 archmain ntpd[484]: 85.91.1.180 local addr 192.168.1.2 -> <null>
Jun 27 08:32:18 archmain systemd[1]: Stopped target Sound Card.
Jun 27 08:32:18 archmain ntpd[484]: 72.87.88.203 local addr 192.168.1.2 -> <null>
Jun 27 08:32:18 archmain systemd[1]: Stopped target Timers.
Jun 27 08:32:18 archmain avahi-daemon[443]: Got SIGTERM, quitting.
Jun 27 08:32:18 archmain systemd[1]: logrotate.timer: Succeeded.
Jun 27 08:32:18 archmain avahi-daemon[443]: Leaving mDNS multicast group on interface enp2s0.IPv6 with address fe80::4a3a:cf5d:c2ef:d32d.
Jun 27 08:32:18 archmain systemd[1]: Stopped Daily rotation of log files.
Jun 27 08:32:18 archmain avahi-daemon[443]: Leaving mDNS multicast group on interface enp2s0.IPv4 with address 192.168.1.2.
Jun 27 08:32:18 archmain systemd[1]: man-db.timer: Succeeded.
Jun 27 08:32:18 archmain avahi-daemon[443]: Leaving mDNS multicast group on interface lo.IPv6 with address ::1.
Jun 27 08:32:18 archmain systemd[1]: Stopped Daily man-db regeneration.
Jun 27 08:32:18 archmain avahi-daemon[443]: Leaving mDNS multicast group on interface lo.IPv4 with address 127.0.0.1.
Jun 27 08:32:18 archmain systemd[1]: pkgstats.timer: Succeeded.
Jun 27 08:32:18 archmain systemd[1]: Stopped Weekly pkgstats submission.
Jun 27 08:32:18 archmain systemd[1]: shadow.timer: Succeeded.
Jun 27 08:32:18 archmain sshd[479]: Received signal 15; terminating.
Jun 27 08:32:18 archmain systemd[1]: Stopped Daily verification of password and group files.
Jun 27 08:32:18 archmain systemd[1]: systemd-tmpfiles-clean.timer: Succeeded.
Jun 27 08:32:18 archmain systemd[1]: Stopped Daily Cleanup of Temporary Directories.
Jun 27 08:32:18 archmain systemd[1]: updatedb.timer: Succeeded.
Jun 27 08:32:18 archmain systemd[1]: Stopped Daily locate database update.
Jun 27 08:32:18 archmain systemd[1]: Stopped target System Time Synchronized.
Jun 27 08:32:18 archmain systemd[1]: Stopped target System Time Set.
Jun 27 08:32:18 archmain systemd[1]: lvm2-lvmpolld.socket: Succeeded.
Jun 27 08:32:18 archmain systemd[1]: Closed LVM2 poll daemon socket.
Jun 27 08:32:18 archmain systemd[1]: systemd-rfkill.socket: Succeeded.
Jun 27 08:32:18 archmain systemd[1]: Closed Load/Save RF Kill Switch Status /dev/rfkill Watch.
Jun 27 08:32:18 archmain systemd[1]: Stopping Save/Restore Sound Card State...
Jun 27 08:32:18 archmain systemd[1]: Stopping Avahi mDNS/DNS-SD Stack...
Jun 27 08:32:18 archmain systemd[1]: Stopping Manage, Install and Generate Color Profiles...
Jun 27 08:32:18 archmain systemd[1]: Stopping Periodic Command Scheduler...
Jun 27 08:32:18 archmain systemd[1]: Stopping Initialize hardware monitoring sensors...
Jun 27 08:32:18 archmain systemd[1]: Starting Generate shutdown-ramfs...
Jun 27 08:32:18 archmain systemd[1]: Stopping Network Time Service...
Jun 27 08:32:18 archmain systemd[1]: Stopping CUPS Scheduler...
Jun 27 08:32:18 archmain systemd[1]: Stopping Authorization Manager...
Jun 27 08:32:18 archmain systemd[1]: Stopping CyberPower UPS...
Jun 27 08:32:18 archmain systemd[1]: Stopping RealtimeKit Scheduling Policy Service...
Jun 27 08:32:18 archmain systemd[1]: Stopping Simple Desktop Display Manager...
Jun 27 08:32:18 archmain systemd[1]: Stopping Samba SMB Daemon...
Jun 27 08:32:18 archmain systemd[1]: Stopping OpenSSH Daemon...
Jun 27 08:32:18 archmain audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=pwrstatd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'                                                                                                                               
Jun 27 08:32:18 archmain systemd[1]: Stopping Load/Save Random Seed...
Jun 27 08:32:18 archmain systemd[1]: Stopping Disk Manager...
Jun 27 08:32:18 archmain systemd[1]: Stopping Daemon for power management...
Jun 27 08:32:18 archmain systemd[1]: pwrstatd.service: Succeeded.
Jun 27 08:32:18 archmain systemd[1]: Stopped CyberPower UPS.
Jun 27 08:32:18 archmain sddm[504]: Error from greeter session: "Process crashed"
Jun 27 08:32:18 archmain sddm[504]: Auth: sddm-helper crashed (exit code 15)
Jun 27 08:32:18 archmain sddm[504]: Error from greeter session: "Process crashed"
Jun 27 08:32:18 archmain sddm[504]: Auth: sddm-helper exited with 15
Jun 27 08:32:18 archmain sddm[504]: Greeter stopped.
Jun 27 08:32:18 archmain sddm[504]: Signal received: SIGTERM

cat /etc/sddm.conf

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[General]
InputMethod=
Numlock=none

[Theme]
CursorTheme=Adwaita
DisableAvatarsThreshold=3
EnableAvatars=true
FacesDir=/usr/share/sddm/faces
ThemeDir=/usr/share/sddm/themes

[Users]
RememberLastSession=false
RememberLastUser=true
ReuseSession=false

[Wayland]
EnableHiDPI=true
SessionCommand=/usr/share/sddm/scripts/wayland-session
SessionDir=/usr/share/wayland-sessions
SessionLogFile=.local/share/sddm/wayland-session.log

[X11]
DisplayCommand=/usr/share/sddm/scripts/Xsetup
DisplayStopCommand=/usr/share/sddm/scripts/Xstop
EnableHiDPI=true
MinimumVT=1
ServerArguments=-nolisten tcp
ServerPath=/usr/bin/X
SessionCommand=/usr/share/sddm/scripts/Xsession
SessionDir=/usr/share/xsessions
SessionLogFile=.local/share/sddm/xorg-session.log
UserAuthFile=.Xauthority
XauthPath=/usr/bin/xauth
XephyrPath=/usr/bin/Xephyr

Ticket opened on Github for sddm, but it appears to be a plasma issue. In any case, here is the other reference:
https://github.com/sddm/sddm/issues/1261

lcornell wrote:Ticket opened on Github for sddm, but it appears to be a plasma issue. In any case, here is the other reference:
https://github.com/sddm/sddm/issues/1261

Please report this to https://bugs.kde.org, the forum is the wrong place for bug reports.

Not a plasma bug. It is sddm.