Confirmed. In the meantime, you can connect manually using socket.create_connection():

>>> import ssl, socket
>>> conn = socket.create_connection(("2001:888:2003:1004:c2ff:eeff:fe00:133", 443))
>>> sock = ssl.wrap_socket(conn)
>>> ssl.DER_cert_to_PEM_cert(sock.getpeercert(True))
'-----BEGIN CERTIFICATE-----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\neG8F7g==\n-----END CERTIFICATE-----\n'