OpenSSL 3.0.0: TLS 1.0 / 1.1 connections fail with TLSV1_ALERT_INTERNAL_ERROR

GitHub fields:

assignee = 'https://github.com/tiran'
closed_at = None
created_at = <Date 2021-04-09.13:08:57.214>
labels = ['expert-SSL', 'type-bug', '3.8', '3.9', '3.10']
title = 'OpenSSL 3.0.0: TLS 1.0 / 1.1 connections fail with TLSV1_ALERT_INTERNAL_ERROR'
updated_at = <Date 2021-04-09.14:02:12.953>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2021-04-09.14:02:12.953>
actor = 'miss-islington'
assignee = 'christian.heimes'
closed = False
closed_date = None
closer = None
components = ['SSL']
creation = <Date 2021-04-09.13:08:57.214>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 43791
keywords = ['patch']
message_count = 3.0
messages = ['390618', '390623', '390629']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'miss-islington']
pr_nums = ['25307', '25308']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43791'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']