IDLE fails to detect corresponding opening parenthesis

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2020-07-24.19:10:41.733>
labels = ['expert-IDLE', 'type-bug', '3.8', '3.9', '3.10']
title = 'IDLE fails to detect corresponding opening parenthesis'
updated_at = <Date 2020-07-26.23:35:02.207>
user = 'https://bugs.python.org/AlexeyBurdin'

bugs.python.org fields:

activity = <Date 2020-07-26.23:35:02.207>
actor = 'Lewis Ball'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2020-07-24.19:10:41.733>
creator = 'Alexey Burdin'
dependencies = []
files = []
hgrepos = []
issue_num = 41388
keywords = []
message_count = 9.0
messages = ['374205', '374218', '374224', '374225', '374226', '374274', '374298', '374301', '374350']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'taleinat', 'Alexey Burdin', 'Lewis Ball']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41388'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']