Related to T336610: TestHttpStatus::test_follow_redirects fails with OAUTH credentials in user-config.py

Steps to replicate the issue (include links if applicable):
Run the following python script:

#!/usr/bin/env python

import requests
from requests_oauthlib import OAuth1

r1 = requests.get('https://en.wikipedia.org/wiki/Main%20Page', auth=OAuth1('', '', '', ''))
r2 = requests.get('https://en.wikipedia.org/wiki/Main%20Page', auth=None)

print(f"{r1.url=}, {r1.history=}")
print(f"{r2.url=}, {r2.history=}")

What happens?:
It prints:

r1.url='https://en.wikipedia.org/wiki/Main%20Page', r1.history=[]
r2.url='https://en.wikipedia.org/wiki/Main_Page', r2.history=[<Response [301]>]

indicating that when OAuth credentials are supplied, the URL is not redirected.

What should have happened instead?:

Both requests should result in a redirect to the canonical URL. In the example above, that's obviously not valid credentials, but it shouldn't matter; there's nothing about this request which requires authentication. I can also reproduce this behavior with valid OAuth credentials, but not including those in the report for privacy reasons.

Software version (skip for WMF-hosted wikis like Wikipedia):

I can reproduce this on either:

MacOS 12.6.1
Python 3.9.13
certifi==2023.5.7
charset-normalizer==3.1.0
idna==3.4
oauthlib==3.2.2
requests==2.30.0
requests-oauthlib==1.3.1
urllib3==2.0.2

or

Debian 11.7
Python 3.9.2
certifi==2023.5.7
charset-normalizer==3.1.0
idna==3.4
oauthlib==3.2.2
requests==2.30.0
requests-oauthlib==1.3.1
urllib3==2.0.2

I cannot reproduce this with command-line curl, i.e.

$ curl -H "AuthToken: 0000" -v https://en.wikipedia.org/wiki/Main%20Page

redirects to https://en.wikipedia.org/wiki/Main_Page as it should. This is either a bug in MediaWiki or a bug in the python requests library. Neither one seems likely, and I figure whichever one I report a bug to will point the finger at the other, so flipping a coin and starting here.