Strange readline save history behaviour in site.py

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-10-27.17:24:21.262>
labels = ['type-bug', 'library', '3.10']
title = 'Strange readline save history behaviour in site.py'
updated_at = <Date 2021-10-27.17:24:21.262>
user = 'https://github.com/doraeric'

bugs.python.org fields:

activity = <Date 2021-10-27.17:24:21.262>
actor = 'doraeric'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-10-27.17:24:21.262>
creator = 'doraeric'
dependencies = []
files = []
hgrepos = []
issue_num = 45632
keywords = []
message_count = 1.0
messages = ['405114']
nosy_count = 1.0
nosy_names = ['doraeric']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45632'
versions = ['Python 3.10']