Pygithub: Branch object is missing most attributes and methods

I'm playing around with this library with the hopes that I can automate things on our Github Enterprise. One of the first things I need to do is to set branch protections for our repos. However, when I initiate a Branch object from a test repository (that already had branch protections set, mind you), the only attribute it has assigned is "name", and most of the methods listed in the documentation don't exist on the object:

import github
github.enable_console_debug_logging()
Github = github.Github

Github("myuser",
'mycreds',
base_url="https://ghe.workworkwork.com/api/v3")

master = g.get_user("myuser").get_repo('cookbook1').get_branch('master')
print master
print master.protection_url

The output:

...
GET https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/branches/master {'Authorization': 'Basic (login and password removed)', 'User-Agent': 'PyGithub/Python'} None ==> 200 {'status': '200 OK', 'content-length': '2925', 'x-github-media-type': 'github.v3', 'x-content-type-options': 'nosniff', 'content-security-policy': "default-src 'none'", 'access-control-expose-headers': 'ETag, Link, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval', 'x-github-request-id': '0ec6f4e8-2355-41dc-859d-0e7076a294b1', 'strict-transport-security': 'max-age=31536000; includeSubdomains', 'vary': 'Accept, Authorization, Cookie, X-GitHub-OTP', 'server': 'GitHub.com', 'access-control-allow-origin': '*', 'etag': '"965449c848ed3319d7e028c2a587f414"', 'x-xss-protection': '1; mode=block', 'cache-control': 'private, max-age=60, s-maxage=60', 'date': 'Thu, 16 Aug 2018 23:41:19 GMT', 'x-frame-options': 'deny', 'x-oauth-scopes': 'admin:org_hook, admin:pre_receive_hook, admin:repo_hook, repo', 'content-type': 'application/json; charset=utf-8', 'x-accepted-oauth-scopes': ''} {"name":"master","commit":{"sha":"3548233b67c8ec4cad703ff947fa0ba022df7c66","commit":{"author":{"name":"Garrett Anderson","email":"[email protected]","date":"2018-08-16T18:44:44Z"},"committer":{"name":"GitHub Enterprise","email":"[email protected]","date":"2018-08-16T18:44:44Z"},"message":"Merge pull request #8 from myuser/newfork\n\nwhat","tree":{"sha":"44b3a300094b2ccbbfb79ea7df5f82e627c12b42","url":"https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/git/trees/44b3a300094b2ccbbfb79ea7df5f82e627c12b42"},"url":"https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/git/commits/3548233b67c8ec4cad703ff947fa0ba022df7c66","comment_count":0},"url":"https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/commits/3548233b67c8ec4cad703ff947fa0ba022df7c66","html_url":"https://ghe.workworkwork.com/myuser/cookbook1/commit/3548233b67c8ec4cad703ff947fa0ba022df7c66","comments_url":"https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/commits/3548233b67c8ec4cad703ff947fa0ba022df7c66/comments","author":{"login":"myuser","id":593,"avatar_url":"https://ghe.workworkwork.com/avatars/u/593?","gravatar_id":"","url":"https://ghe.workworkwork.com/api/v3/users/myuser","html_url":"https://ghe.workworkwork.com/myuser","followers_url":"https://ghe.workworkwork.com/api/v3/users/myuser/followers","following_url":"https://ghe.workworkwork.com/api/v3/users/myuser/following{/other_user}","gists_url":"https://ghe.workworkwork.com/api/v3/users/myuser/gists{/gist_id}","starred_url":"https://ghe.workworkwork.com/api/v3/users/myuser/starred{/owner}{/repo}","subscriptions_url":"https://ghe.workworkwork.com/api/v3/users/myuser/subscriptions","organizations_url":"https://ghe.workworkwork.com/api/v3/users/myuser/orgs","repos_url":"https://ghe.workworkwork.com/api/v3/users/myuser/repos","events_url":"https://ghe.workworkwork.com/api/v3/users/myuser/events{/privacy}","received_events_url":"https://ghe.workworkwork.com/api/v3/users/myuser/received_events","type":"User","site_admin":true},"committer":null,"parents":[{"sha":"067642113fe45ee77160ee28cafc4870f2c06b6a","url":"https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/commits/067642113fe45ee77160ee28cafc4870f2c06b6a","html_url":"https://ghe.workworkwork.com/myuser/cookbook1/commit/067642113fe45ee77160ee28cafc4870f2c06b6a"},{"sha":"3a9479c605617a9035cd986a4bf77880ac5dde64","url":"https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/commits/3a9479c605617a9035cd986a4bf77880ac5dde64","html_url":"https://ghe.workworkwork.com/myuser/cookbook1/commit/3a9479c605617a9035cd986a4bf77880ac5dde64"}]},"_links":{"self":"https://ghe.workworkwork.com/api/v3/repos/myuser/cookbook1/branches/master","html":"https://ghe.workworkwork.com/myuser/cookbook1/tree/master"}}

Branch(name="master")

AttributeError: 'Branch' object has no attribute 'protection_url'

There aren't any of the methods there either:

print master.get_required_status_checks()
OUTPUT:
AttributeError: 'Branch' object has no attribute 'get_required_status_checks'

Or this attribute:

print master.protection
OUTPUT:
return self._protected.value
AttributeError: 'Branch' object has no attribute '_protected'

The object looks like this:

print dir(master)
OUTPUT:
['CHECK_AFTER_INIT_FLAG', '_GithubObject__makeSimpleAttribute', '_GithubObject__makeSimpleListAttribute', '_GithubObject__makeTransformedAttribute', '__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_commit', '_completeIfNeeded', '_headers', '_initAttributes', '_makeBoolAttribute', '_makeClassAttribute', '_makeDatetimeAttribute', '_makeDictAttribute', '_makeDictOfStringsToClassesAttribute', '_makeIntAttribute', '_makeListOfClassesAttribute', '_makeListOfIntsAttribute', '_makeListOfListOfStringsAttribute', '_makeListOfStringsAttribute', '_makeStringAttribute', '_makeTimestampAttribute', '_name', '_parentUrl', '_rawData', '_requester', '_storeAndUseAttributes', '_useAttributes', 'commit', 'contexts', 'enforcement_level', 'etag', 'get__repr__', 'last_modified', 'name', 'protected', 'raw_data', 'raw_headers', 'setCheckAfterInitFlag']

It looks like the object isn't being created properly.