I am tryin to use this module https://apps.odoo.com/apps/modules/12.0/partner_fax/

Module is installed, I can see in res.partner added field Fax. I can add/edit field Fax in Odoo. So far so good. 

But when I try to create record with script and create function I got this error

ValueError: Invalid field 'fax' on model 'res.partner'

My code looks like this:

#!/usr/bin/python3 

from __future__ import print_function
from odoo.api import Environment
import odoo
import csv

def connect(dbname='Test', uid=1, context=None):
r = odoo.registry(dbname)
cr = r.cursor()
Environment.reset()
env = Environment(cr, uid, context or {})
print('Connected to %s with user %s %s'
% (dbname, env.uid, env.user.name))
return env

env = connect('odoo13')

env['res.partner'].create({
'name': 'Test 123',
'fax':'99999',
}
)
env.cr.commit()

Importand part of module:

https://github.com/OCA/partner-contact/blob/13.0/partner_fax/views/res_partner.xml

https://github.com/OCA/partner-contact/blob/13.0/partner_fax/models/res_partner.py