AttributeError: module 'importlib' has no attribute 'util' II – Debian

I have a problem very similar to this one but I’m not about using gcloud but I’m trying to run pyqtdeploy.

I’m facing a strange problem: Running

>>> import importlib
>>> importlib.util.spec_from_file_location()

gives me

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'importlib' has no attribute 'util'

..using Python3.8.6 with importlib-1.0.4 running on a Debian 10 +testing machine

while the exact same commands on Fedora 32 also running Python3.8.6 with importlib-1.0.4 let me use importlib.util:

>>> importlib.util.spec_from_file_location()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: spec_from_file_location() missing 1 required positional argument: 'name'

Why can the exact same module have an attribute on one system and not on the other?

And how do I make pyqtdeploy (and thus importlib.util) work as expected?

Background: I’m currently trying to run pyqtdeploy inside a Docker container but despite I’m using the same versions of Python and importlib it will run on the Fedora host but not inside the container..