Confusing error messages for %-formatting, related to escaped %-characters

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-01-29.14:49:09.257>
labels = ['interpreter-core', 'type-bug', '3.11']
title = 'Confusing error messages for %-formatting, related to escaped %-characters'
updated_at = <Date 2022-01-28.20:04:26.600>
user = 'https://github.com/cfbolz'

bugs.python.org fields:

activity = <Date 2022-01-28.20:04:26.600>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2020-01-29.14:49:09.257>
creator = 'Carl.Friedrich.Bolz'
dependencies = []
files = []
hgrepos = []
issue_num = 39486
keywords = []
message_count = 4.0
messages = ['360965', '360974', '360977', '412029']
nosy_count = 4.0
nosy_names = ['Carl.Friedrich.Bolz', 'SilentGhost', 'serhiy.storchaka', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39486'
versions = ['Python 3.11']