I confirm this issue with python 3.7

but your script is wrong (you declare f and use x in your script)

/tmp$ mkdir demo
/tmp$ cd demo/
/t/demo$ mkdir tmp                                                                                                                                               /t/demo$ touch foo                                                                                                                                               /t/demo$ ln -s foo tmp/foo                                                                                                                                       /t/demo$ cd tmp/                                                                                                                                                 /t/d/tmp$ file foo                                                                                                                                               
foo: broken symbolic link to foo

/t/d/tmp$ python3                                                                                                                                                mar 19 fév 2019 13:20:15 CET
Python 3.7.2 (default, Jan 16 2019, 19:49:22) 
[GCC 8.2.1 20181215 (Red Hat 8.2.1-6)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pathlib import Path
>>> for p in Path().rglob('*'):
...     print(p)
... 
foo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib64/python3.7/pathlib.py", line 1105, in rglob
    for p in selector.select_from(self):
  File "/usr/lib64/python3.7/pathlib.py", line 552, in _select_from
    for starting_point in self._iterate_directories(parent_path, is_dir, scandir):
  File "/usr/lib64/python3.7/pathlib.py", line 536, in _iterate_directories
    entry_is_dir = entry.is_dir()
OSError: [Errno 40] Too many levels of symbolic links: './foo'
>>>