Updated today? Looks like ktextwidgets changed things & rebuilds are needed. pacman -Q ktextaddons
Check in your /var/cache/pacman/pkgs cache to see if you have older ktextaddons available, if so, downgrade with pacman -U.
Or use the backup mirror to install an older version 'sudo pacman -U https://ca.kaosx.cf/apps/ktextaddons-1.2.0-1-x86_64.pkg.tar.zst`
If that fixes, then rebuilds of at least pimcommon will be needed.
EDIT:
Rebuild is needed, just checked pimcommon:
ldd /usr/lib/libKF5PimCommon.so.5.23.0 qt6
linux-vdso.so.1 => linux-vdso.so.1 (0x00007fff24d8b000)
libKPim5TextEdit.so.5 => /usr/lib/libKPim5TextEdit.so.5 (0x00007f18b376b000)
libKF5TextAutoCorrection.so.1 => not found
.....
One more edit, pimcommon is not ready for ktextaddons 1.2.0, so ktextaddons is downgraded & epoch added, regular pacman -Syu
will get you the needed version.