Gnome feeds: AttributeError prevents any articles from loading

Copied/migrated from: https://gitlab.com/gabmus/gnome-feeds/-/issues/97

Gfeeds v0.16.2 on postmarketOS Edge.

Opening an article doesn't work. I can see the following stacktrace in a terminal:

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/gfeeds/webview.py", line 247, in set_enable_reader_mode
    self._set_enable_reader_mode_async_callback()
  File "/usr/lib/python3.9/site-packages/gfeeds/webview.py", line 220, in _set_enable_reader_mode_async_callback
    self.webkitview.load_html(build_reader_html(
  File "/usr/lib/python3.9/site-packages/gfeeds/build_reader_html.py", line 111, in build_reader_html
    doc = readability.Document(og_html)
AttributeError: module 'readability' has no attribute 'Document'

The viewer is set to reader mode fwiw.