docs say print(metadata.state) but it's None

[castedo]

STEPS:
Following the steps on https://python.commonmeta.org/readers/crossref_reader using the main branch as of Mar 11 2025, namely:

from commonmeta import Metadata
string = '10.7554/elife.01567'
metadata = Metadata(string)

# Check that metadata was fetched successfully
print(metadata.state)

GOT:
No output because metadata.state is None.

However I did fetch data:

>>> metadata.url
'https://elifesciences.org/articles/01567'
>>> metadata.date
{'published': '2014-02-11'}
>>> metadata.is_valid
True

Also, as of today Mar 12 2025 at least, the static generation of page https://python.commonmeta.org/readers/crossref_reader is not generating the output due to ModuleNotFoundError: No module named 'regex._regex'.