Unicode and ascii regular expressions do not agree on ascii space characters

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-11-22.13:27:59.303>
labels = ['expert-regex', 'type-feature', '3.11']
title = 'Unicode and acii regular expressions do not agree on ascii space characters'
updated_at = <Date 2021-11-23.13:56:56.369>
user = 'https://github.com/jorants'

bugs.python.org fields:

activity = <Date 2021-11-23.13:56:56.369>
actor = 'arhadthedev'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Regular Expressions']
creation = <Date 2021-11-22.13:27:59.303>
creator = 'control-k'
dependencies = []
files = ['50457']
hgrepos = []
issue_num = 45869
keywords = []
message_count = 6.0
messages = ['406773', '406787', '406796', '406818', '406819', '406837']
nosy_count = 5.0
nosy_names = ['ezio.melotti', 'mrabarnett', 'steven.daprano', 'control-k', 'arhadthedev']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45869'
versions = ['Python 3.11']