While migrating a project from setuptools to uv I cannot get a namespace package correct:

First the "setuptools version" of the project:

It contains directives for finding the namespace packages (in setup.cfg):

...
package_dir = =src
packages = find_namespace:
[options.packages.find]
where = src
include = a.b.*
...

The file layout of MyPackage is as follows:

pyproject.toml
setup.cfg
src/a/b/MyPackage
        __init__.py
        SomeSubPackage
           __init__.py

pip install -e .
MyPackage is now available using namespace "a.b":

import a.b.MyPackage

Now the "uv version" of the project:
(relevant parts)

It uses following lines in pyproject.toml for specifiying the package:

...
[tool.hatch.build.targets.wheel]
packages = ["src/a/b/MyPackage"]
...

uv sync
will get the depenedencies and creates an editable installation in .venv

This makes MyPackage available without the namespace part

import MyPackage

Which is not what I want, MyPackage should be available in namespace "a.b"

I cannot not find a way how to configure it such that i can import the package as "a.b.MPackage".
I tried variations like:
packages = ["src/*"]

But none of the variations work.