Cannot import file from fakefs

[Aran-Fey]

Describe the bug
Files that only exist on the fake file system cannot be imported, neither with a regular import statement nor via importlib.

How To Reproduce

import pytest

import importlib.util
import sys
from pathlib import Path


def test_import(fs):
    module_path = Path('heya.py')
    module_path.write_text('x = 1234')
    
    spec = importlib.util.spec_from_file_location('heya', module_path)
    module = importlib.util.module_from_spec(spec)

    sys.modules['heya'] = module
    spec.loader.exec_module(module)  # Crashes with FileNotFoundError


if __name__ == '__main__':
    pytest.main([__file__])

Your environment

Windows-11-10.0.22631-SP0
Python 3.12.0 (tags/v3.12.0:0fb18b0, Oct 2 2023, 13:03:39) [MSC v.1935 64 bit (AMD64)]
pyfakefs 5.7.1
pytest 7.3.2