The libxml2 package prior to version 2.9.12-6 was missing the compiled python modules. This has been fixed in 2.9.12-6, so the upgrade may need to overwrite any untracked pyc files created. If you get errors like these

libxml2: usr/lib/python3.10/site-packages/__pycache__/drv_libxml2.cpython-310.opt-1.pyc exists in filesystem libxml2: usr/lib/python3.10/site-packages/__pycache__/drv_libxml2.cpython-310.pyc exists in filesystem libxml2: usr/lib/python3.10/site-packages/__pycache__/libxml2.cpython-310.opt-1.pyc exists in filesystem libxml2: usr/lib/python3.10/site-packages/__pycache__/libxml2.cpython-310.pyc exists in filesystem

when updating, use

pacman -Suy --overwrite /usr/lib/python3.10/site-packages/__pycache__/*

to perform the upgrade.