pkgutil.walk_packages jumps out from given path if there is package with the same name in sys.path

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-02-20.16:37:07.621>
labels = ['3.8', 'type-bug', 'library']
title = 'pkgutil.walk_packages jumps out from given path if there is package with the same name in sys.path'
updated_at = <Date 2019-07-24.12:03:00.550>
user = 'https://github.com/ekiro'

bugs.python.org fields:

activity = <Date 2019-07-24.12:03:00.550>
actor = 'karkucik'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-02-20.16:37:07.621>
creator = 'karkucik'
dependencies = []
files = []
hgrepos = []
issue_num = 36053
keywords = ['patch']
message_count = 6.0
messages = ['336111', '339028', '339573', '339603', '343747', '348381']
nosy_count = 2.0
nosy_names = ['ncoghlan', 'karkucik']
pr_nums = ['11956']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36053'
versions = ['Python 3.8']