importlib: lazy loading can result in reimporting a submodule

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-02-10.18:19:50.330>
labels = ['type-bug', 'library', '3.9', '3.10', '3.11']
title = 'importlib: lazy loading can result in reimporting a submodule'
updated_at = <Date 2022-01-17.22:39:32.839>
user = 'https://github.com/poxthegreat'

bugs.python.org fields:

activity = <Date 2022-01-17.22:39:32.839>
actor = 'brett.cannon'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-02-10.18:19:50.330>
creator = 'Pox TheGreat'
dependencies = []
files = ['48889']
hgrepos = []
issue_num = 39602
keywords = []
message_count = 1.0
messages = ['361705']
nosy_count = 2.0
nosy_names = ['brett.cannon', 'Pox TheGreat']
pr_nums = []
priority = 'low'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39602'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']