Unrecoverable exception with from ..import ccc

[paternal]

Hello,
I got ERROR: Unrecoverable exception thrown when parsing ./aaa/bbb/ccc.py! This should NEVER happen.

$ python --version
Python 3.11.4
$ isort --version

                 _                 _
                (_) ___  ___  _ __| |_
                | |/ _/ / _ \/ '__  _/
                | |\__ \/\_\/| |  | |_
                |_|\___/\___/\_/   \_/

      isort your imports, so you don't have to.

                    VERSION 5.12.0
$ cat /etc/debian_version 
trixie/sid
$ tree
.
└── aaa
    └── bbb
        └── ccc.py

Content of the offending file:

$ cat aaa/bbb/ccc.py 
from ..import bbb

My file is valid (or I just found a Python bug):

$ python -m aaa.bbb.ccc
$

But isort fails:

$ isort .
ERROR: Unrecoverable exception thrown when parsing ./aaa/bbb/ccc.py! This should NEVER happen.
If encountered, please open an issue: https://github.com/PyCQA/isort/issues/new
Traceback (most recent call last):
  File "/home/louis/.virtualenvs/311/bin/isort", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/louis/.virtualenvs/311/lib/python3.11/site-packages/isort/main.py", line 1226, in main
    for sort_attempt in attempt_iterator:
  File "/home/louis/.virtualenvs/311/lib/python3.11/site-packages/isort/main.py", line 1210, in <genexpr>
    sort_imports(  # type: ignore
  File "/home/louis/.virtualenvs/311/lib/python3.11/site-packages/isort/main.py", line 93, in sort_imports
    incorrectly_sorted = not api.sort_file(
                             ^^^^^^^^^^^^^^
  File "/home/louis/.virtualenvs/311/lib/python3.11/site-packages/isort/api.py", line 429, in sort_file
    changed = sort_stream(
              ^^^^^^^^^^^^
  File "/home/louis/.virtualenvs/311/lib/python3.11/site-packages/isort/api.py", line 210, in sort_stream
    changed = core.process(
              ^^^^^^^^^^^^^
  File "/home/louis/.virtualenvs/311/lib/python3.11/site-packages/isort/core.py", line 422, in process
    parsed_content = parse.file_contents(import_section, config=config)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/louis/.virtualenvs/311/lib/python3.11/site-packages/isort/parse.py", line 522, in file_contents
    if "," in import_string.split(just_imports[-1])[-1]:
                                  ~~~~~~~~~~~~^^^^
IndexError: list index out of range

Everything works if I replace from ..import bbb with from .. import bbb (notice the space that was added/removed between .. and import).

Thanks for your work!
-- Louis