email.message_from_string() is unable to find the headers for the .msg files

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-06-29.10:51:06.594>
labels = ['3.8', 'type-feature', 'library']
title = 'email.message_from_string() is unable to find the headers for the .msg files'
updated_at = <Date 2020-08-07.05:50:46.185>
user = 'https://bugs.python.org/jpatel'

bugs.python.org fields:

activity = <Date 2020-08-07.05:50:46.185>
actor = 'Jeffrey.Kintscher'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-06-29.10:51:06.594>
creator = 'jpatel'
dependencies = []
files = ['49273', '49274']
hgrepos = []
issue_num = 41157
keywords = []
message_count = 1.0
messages = ['372560']
nosy_count = 5.0
nosy_names = ['barry', 'r.david.murray', 'maxking', 'Jeffrey.Kintscher', 'jpatel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41157'
versions = ['Python 3.8']