sys.stdin does not iterate correctly on '\r' line separator

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-10-26.19:20:29.117>
labels = ['3.8', 'type-bug', 'library']
title = "sys.stdin does not iterate correctly on '\\r' line separator"
updated_at = <Date 2021-11-01.18:00:35.253>
user = 'https://github.com/kellyjonbrazil'

bugs.python.org fields:

activity = <Date 2021-11-01.18:00:35.253>
actor = 'kbrazil'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-10-26.19:20:29.117>
creator = 'kbrazil'
dependencies = []
files = []
hgrepos = []
issue_num = 45617
keywords = []
message_count = 7.0
messages = ['405057', '405067', '405103', '405111', '405113', '405381', '405459']
nosy_count = 3.0
nosy_names = ['eric.araujo', 'eryksun', 'kbrazil']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45617'
versions = ['Python 3.8']