Weakref callbacks running before finalizers in GC collection

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-04-17.19:52:40.901>
labels = ['interpreter-core', '3.8', 'type-bug', '3.7', '3.9']
title = 'Weakref callbacks running before finalizers in GC collection'
updated_at = <Date 2020-04-20.21:54:30.265>
user = 'https://github.com/a-feld'

bugs.python.org fields:

activity = <Date 2020-04-20.21:54:30.265>
actor = 'tim.peters'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2020-04-17.19:52:40.901>
creator = 'a-feld'
dependencies = []
files = ['49076']
hgrepos = []
issue_num = 40312
keywords = ['patch']
message_count = 17.0
messages = ['366675', '366750', '366751', '366753', '366754', '366797', '366844', '366845', '366848', '366850', '366853', '366857', '366859', '366862', '366864', '366873', '366895']
nosy_count = 4.0
nosy_names = ['tim.peters', 'pablogsal', 'a-feld', 'deekay']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40312'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']