Cython 3.0.10 class member scoping anomaly: Minimally Reproducible Example

dotbug-mre.pyx

# src/dotbug/dotbug-mre.pyx
cdef extern from "mycpp.h" namespace "my::name::space":
    cdef cppclass MyClass:
        int LIFE

cdef class MyMgr:
    def my_failing_function(self) -> None:
        cdef int life = MyClass.LIFE
"""
Results in C++ compilation error:

gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -Iinclude -I/tmp/build-env-zm7iab4k/include -I/home/ANT.AMAZON.COM/ewancoe/.pyenv/versions/3.10.1/include/python3.10 -c src/dotbug/dotbug-mre.cpp -o build/temp.linux-x86_64-cpython-310/src/dotbug/dotbug-mre.o -std=c++2a
src/dotbug/dotbug-mre.cpp: In function ‘PyObject* __pyx_pf_6dotbug_5MyMgr_my_failing_function(__pyx_obj_6dotbug_MyMgr*)’:
src/dotbug/dotbug-mre.cpp:1482:39: error: expected primary-expression before ‘.’ token
 1482 |   __pyx_t_1 = my::name::space::MyClass.LIFE;
      |                                       ^
error: command '/usr/bin/gcc' failed with exit code 1

Generated code segment:

  /* "src/dotbug/dotbug-mre.pyx":7
 * cdef class MyMgr:
 *     def my_failing_function(self) -> None:
 *         cdef int life = MyClass.LIFE             # <<<<<<<<<<<<<<
 * 
 * """
 */
  __pyx_t_1 = my::name::space::MyClass.LIFE;
  __pyx_v_life = __pyx_t_1;

"""

MANIFEST.in

include src/dotbug/*.pyx
include src/dotbug/*.pxd
include include/*.h

mycpp.h

// include/mycpp.h
namespace my::name::space
{
class MyClass
{
public:
    static inline int LIFE { 42 };
};
}

pyproject.toml

[build-system]
requires = [
    "setuptools>=42",
    "wheel",
    "Cython",
]
build-backend = "setuptools.build_meta"

setup.py

from setuptools import setup, Extension
from Cython.Build import cythonize

ext_modules = [
    Extension(
        "dotbug",
        sources=["src/dotbug/dotbug-mre.pyx"],
        include_dirs=['include'],
        language="c++",
        extra_compile_args=["-std=c++2a"],
    ),
]
setup(
    name="dotbug", packages=["dotbug"], package_dir={'': 'src'},
    ext_modules=cythonize(ext_modules, language_level="3"),
)