Oh never mind me, I am using a version of mkdocs-material which is from the AUR, but it has been moved into extra and I did not catch that they missed the python-regex dependency. I will file a bug against it and add it to the makedepends here in the meantime.

INeedTogepi, please try running this script and tell me if it picks up on any packages:

#!/bin/sh
real_python_dir=$(pacman -Ql python | grep /usr/lib/python | head -1 | cut -d/ -f-4 | cut -d' ' -f2)
set -- /usr/lib/python3.*
for d do
    if [ -e "$d" ] && [ "$d" != "$real_python_dir" ]; then
        set -- "$@" "$d"
    fi
    shift
done

if [ "$#" -ne 0 ]; then
    printf '\033[1;31m%s\033[0m\n' 'WARNING: You have out-of-date python packages, as follows:'
    pacman -Qo -- "$@"
fi

Getting this error when trying to build this:

==> Building documentation...
Traceback (most recent call last):
  File "/usr/bin/mkdocs", line 8, in <module>
    sys.exit(cli())
             ^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mkdocs/__main__.py", line 281, in build_command
    cfg = config.load_config(**kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mkdocs/config/base.py", line 374, in load_config
    errors, warnings = cfg.validate()
                       ^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mkdocs/config/base.py", line 231, in validate
    run_failed, run_warnings = self._validate()
                               ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mkdocs/config/base.py", line 188, in _validate
    self[key] = config_option.validate(value)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mkdocs/config/config_options.py", line 186, in validate
    return self.run_validation(value)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mkdocs/config/config_options.py", line 1075, in run_validation
    self.load_plugin_with_namespace(name, cfg)
  File "/usr/lib/python3.12/site-packages/mkdocs/config/config_options.py", line 1113, in load_plugin_with_namespace
    return (name, self.load_plugin(name, config))
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mkdocs/config/config_options.py", line 1131, in load_plugin
    plugin_cls = self.installed_plugins[name].load()
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/importlib/metadata/__init__.py", line 205, in load
    module = import_module(match.group('module'))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 995, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/usr/lib/python3.12/site-packages/material/plugins/search/plugin.py", line 24, in <module>
    import regex as re
ModuleNotFoundError: No module named 'regex'
==> ERROR: A failure occurred in build().
    Aborting...