See the code example below.

```python
import platform
import pickle

pack = {
    'uname_result': platform.uname()
}

with open('test.pickle', 'wb') as f:
    pickle.dump(pack, f, protocol=pickle.HIGHEST_PROTOCOL)

with open('test.pickle', 'rb') as f:
    data = pickle.load(f)

```

It works smoothly on Python 3.8.5. However, on Python 3.9.0, the last line produces this error:

```
Traceback (most recent call last):
  File "/Users/crocoduck/pickle/3.9.0/make_pickle.py", line 12, in <module>
    data = pickle.load(f)
TypeError: <lambda>() takes 6 positional arguments but 7 were given
```

The files produced by the code snipped above are attached for reference.

This was observed in macOS Catalina 10.15.7.