Konqueror: doesn't render webpages, garbled

I don’t really have the right words to describe what I’m seeing in the picture above. I’ve never seen anything like it before. This also happens in Konqueror, Help Menu (F1) and Falkon.

Now, I only recently begun to install Arch with Plasma but I’ve been following the Installation Guide fairly closely. Other browsers like Firefox and Vivaldi work fine but I’d really like to have access to KDE Help from within the environment.

System info follows:

Operating System: Arch Linux 
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.9.0
Kernel Version: 6.14.3-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor 1: AMD Radeon Graphics (discrete GFX12)
Graphics Processor 2: AMD Radeon Graphics (integrated)
Manufacturer: ASRock
Product Name: B650 PG Lightning
[caitlin@ARCHGOTH ~]$ pacman -Q | grep "plasma"
kdeplasma-addons 6.3.4-1
libplasma 6.3.4-1
plasma-activities 6.3.4-1
plasma-activities-stats 6.3.4-1
plasma-browser-integration 6.3.4-1
plasma-desktop 6.3.4-1
plasma-disks 6.3.4-1
plasma-firewall 6.3.4-1
plasma-integration 6.3.4-2
plasma-meta 6.3-2
plasma-nm 6.3.4-1
plasma-pa 6.3.4-1
plasma-systemmonitor 6.3.4-1
plasma-thunderbolt 6.3.4-1
plasma-vault 6.3.4-1
plasma-welcome 6.3.4-1
plasma-workspace 6.3.4-2
plasma-workspace-wallpapers 6.3.4-1
plasma5support 6.3.4-1
plasmatube 25.04.0-2

I cleaned up some meta packages manually.

[caitlin@ARCHGOTH ~]$ pacman -Q | grep "kde"
colord-kde 25.04.0-1
kde-accessibility-meta 25.04-1
kde-cli-tools 6.3.4-1
kde-gtk-config 6.3.4-1
kde-inotify-survey 25.04.0-1
kde-office-meta 25.04-1
kde-system-meta 25.04-1
kdebugsettings 25.04.0-1
kdeclarative 6.12.0-1
kdeclarative5 5.116.0-1
kdecoration 6.3.4-1
kded 6.12.0-1
kded5 5.116.0-1
kdeedu-data 25.04.0-1
kdegraphics-mobipocket 25.04.0-1
kdegraphics-thumbnailers 25.04.0-1
kdenetwork-filesharing 25.04.0-1
kdepim-addons 25.04.0-1
kdepim-runtime 25.04.0-1
kdeplasma-addons 6.3.4-1
kdesu 6.12.0-1
kdesu5 5.116.0-1
libblockdev 3.3.0-1
libblockdev-crypto 3.3.0-1
libblockdev-fs 3.3.0-1
libblockdev-loop 3.3.0-1
libblockdev-mdraid 3.3.0-1
libblockdev-nvme 3.3.0-1
libblockdev-part 3.3.0-1
libblockdev-swap 3.3.0-1
libkdegames 25.04.0-1
libkdepim 25.04.0-1
polkit-kde-agent 6.3.4-1
qt5-base 5.15.16+kde+r131-1
qt5-declarative 5.15.16+kde+r22-3
qt5-multimedia 5.15.16+kde+r2-3
qt5-quickcontrols2 5.15.16+kde+r5-3
qt5-speech 5.15.16+kde+r1-3
qt5-svg 5.15.16+kde+r5-3
qt5-wayland 5.15.16+kde+r60-1
xdg-desktop-portal-kde 6.3.4-1