Grimp currently doesn't support the older, pkgutil-style form of namespace packages https://packaging.python.org/en/latest/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages. This is described in more detail in [this comment thread](https://github.com/seddonym/grimp/issues/141#issuecomment-2522714076).
Grimp currently doesn't support the older, pkgutil-style form of namespace packages https://packaging.python.org/en/latest/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages.
This is described in more detail in this comment thread.