SUMMARY *** Kimageformats removes support for jxl. *kimageformats5 5.113.0 * libjxl 0.9.1 (got updated today) Affected software: System Wallpaper > No Wallpaper/changed itself to ugly stock (the one with compression artefacts- remove it from KDE, please). Dolphin > No Thumbnails Gwenview > Cannot Display any jxl photos Lock Screen > No background SDDM Login > No background (complete white). EXPECTED RESULT Fix Regression. Reinstate support for JXL. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.27.10 KDE Frameworks Version: 5.113.0 Qt Version: 5.15.12 kimageformats5 5.113.0 libjxl 0.9.1 gwenview 23.08.4 ADDITIONAL INFORMATION Hmmm, its not the first time that only jpg was not affected by meddling with kimageformats. All others were (avif, for exaple, now jxl...). If you change something. Please check it beforehand if it opens affected files.
This is, once again, a partial upgrade on your side. I'd suggest you consider switching to a different distro since you seem to have trouble properly maintaining an Arch Linux installation (and keep blaming KDE for it)