Started multiprocessing.Process instances are unserialisable

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-03-05.22:19:15.660>
labels = ['type-feature', 'library', '3.11']
title = 'Started multiprocessing.Process instances are unserialisable'
updated_at = <Date 2022-03-05.23:19:58.658>
user = 'https://github.com/maggyero'

bugs.python.org fields:

activity = <Date 2022-03-05.23:19:58.658>
actor = 'maggyero'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-03-05.22:19:15.660>
creator = 'maggyero'
dependencies = []
files = []
hgrepos = []
issue_num = 46934
keywords = ['patch']
message_count = 1.0
messages = ['414597']
nosy_count = 1.0
nosy_names = ['maggyero']
pr_nums = ['31701']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46934'
versions = ['Python 3.11']