installation - QGIS 3.0 can't load plugin processing, no module named 'osgeo', on Manjaro Linux

I have installed QGIS3 from the AUR package, as well as all optional dependencies: https://aur.archlinux.org/packages/qgis/

However, when launching, I receive the following error:

Couldn't load plugin 'processing' 


ModuleNotFoundError: No module named 'osgeo' 
Traceback (most recent call last):
  File "/usr/share/qgis/python/qgis/utils.py", line 311, in loadPlugin
    __import__(packageName)
  File "/usr/share/qgis/python/qgis/utils.py", line 664, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/share/qgis/python/plugins/processing/__init__.py", line 28, in 
    from processing.tools.dataobjects import *          # NOQA
  File "/usr/share/qgis/python/qgis/utils.py", line 664, in _import

    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/share/qgis/python/plugins/processing/tools/dataobjects.py", line 51, in 
    from processing.algs.gdal.GdalUtils import GdalUtils
  File "/usr/share/qgis/python/qgis/utils.py", line 664, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "/usr/share/qgis/python/plugins/processing/algs/gdal/GdalUtils.py", line 35, in 
    from osgeo import gdal
  File "/usr/share/qgis/python/qgis/utils.py", line 664, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
ModuleNotFoundError: No module named 'osgeo'



Python version: 3.6.4 (default, Jan  5 2018, 02:35:40) [GCC 7.2.1 20171224] 
QGIS version: 3.0.0-Girona Girona, exported 

Python Path:
/usr/share/qgis/python
/home/thiago/.local/share/QGIS/QGIS3/profiles/default/python
/home/thiago/.local/share/QGIS/QGIS3/profiles/default/python/plugins
/usr/share/qgis/python/plugins

/usr/lib/python36.zip
/usr/lib/python3.6
/usr/lib/python3.6/lib-dynload
/usr/lib/python3.6/site-packages
/home/thiago/.local/share/QGIS/QGIS3/profiles/default/python

It seems to be a path issue, but I am not sure how to solve it. Pacman shows gdal and python-gdal both as installed.