[Python] Python script can't move file between mounted docker volumes while mv command could

I think I did configure docker volumes correctly, but I can't understand why mv command success called from interactive bash shell.

FROM ubuntu:rolling

RUN apt update

RUN apt install -y python3 python3-venv

USER ubuntu


$ docker run --rm --interactive --tty --volume .:/home/ubuntu/data --volume $HOME/Downloads:/home/ubuntu/downloads --workdir /home/ubuntu/data vntk2:latest bash


>>> import pathlib
>>> pathlib.Path('/home/ubuntu/downloads/SoftwareEngineer.pdf').exists()
True
>>> pathlib.Path('/home/ubuntu/downloads/SoftwareEngineer.pdf').rename(pathlib.Path('/home/ubuntu/data/'))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.12/pathlib.py", line 1365, in rename
os.rename(self, target)
OSError: [Errno 18] Invalid cross-device link: '/home/ubuntu/downloads/SoftwareEngineer.pdf' -> '/home/ubuntu/data'
>>>


ubuntu@d3d1c2e286c2:~/data$ mv /home/ubuntu/downloads/SoftwareEngineer.pdf /home/ubuntu/data/
ubuntu@d3d1c2e286c2:~/data$ ls -lah /home/ubuntu/data/
total 820K
drwxrwxr-x 8 ubuntu ubuntu 4.0K Dec 8 00:03 .
drwxr-x--- 1 ubuntu ubuntu 4.0K Dec 8 00:02 ..
-rw-rw-r-- 1 ubuntu ubuntu 765K Nov 15 12:14 SoftwareEngineer.pdf
ubuntu@d3d1c2e286c2:~/data$

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