implicit-namespace-package (INP001) - false negative when package contains no source files but contains nested packages

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if i have the following folder structure:

.
└── foo/
    └── bar/
        ├── baz.py
        └── __init__.py

i get no error in baz.py because there's an __init__.py file in the bar package, but there should be an error that the bar package does not have an __init__.py.

the correct structure is:

.
└── foo/
    ├── bar/
    │   ├── baz.py
    │   └── __init__.py
    └── __init__.py

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looks like this was fixed in #14236