Importing the same extension module under multiple names breaks non-reinitialisable extension modules

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-02-28.18:51:00.006>
labels = ['extension-modules', '3.8', 'type-bug', '3.7']
title = 'Importing the same extension module under multiple names breaks non-reinitialisable extension modules'
updated_at = <Date 2018-08-25.16:36:18.099>
user = 'https://github.com/Yhg1s'

bugs.python.org fields:

activity = <Date 2018-08-25.16:36:18.099>
actor = 'scoder'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2018-02-28.18:51:00.006>
creator = 'twouters'
dependencies = []
files = []
hgrepos = []
issue_num = 32973
keywords = []
message_count = 9.0
messages = ['313064', '313137', '313138', '313148', '313233', '324066', '324068', '324069', '324077']
nosy_count = 15.0
nosy_names = ['twouters', 'brett.cannon', 'gregory.p.smith', 'amaury.forgeotdarc', 'ncoghlan', 'pitrou', 'scoder', 'vstinner', 'Arfrever', 'r.david.murray', 'petr.viktorin', 'asvetlov', 'eric.snow', 'eudoxos', 'Dormouse759']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32973'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']