Compilation failure with Qt includes in Pybind11 3.0.0

[Tipbs]

Hello, and thank you for the 3.0.0 release!

Since upgrading to Pybind11 v3.0.0, I'm unable to compile my Python module if I include any Qt header. I’ve created a minimal reproducible example below. It compiles fine without the Qt include, but fails when any Qt header is present (e.g. #include <QWidget>).
Should I open a formal issue for this?

main.cpp

#include <pybind11/pybind11.h>
#include <QWidget>

namespace py = pybind11;

PYBIND11_MODULE(test, m) {
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.15...3.29)

find_package(Python)
include(FetchContent)
FetchContent_Declare(
    pybind11
    GIT_REPOSITORY https://github.com/pybind/pybind11
    GIT_TAG        v3.0.0
    GIT_SHALLOW 1
)
FetchContent_MakeAvailable(pybind11)
find_package(Qt6 REQUIRED COMPONENTS Widgets)

project(test)
qt_standard_project_setup()

pybind11_add_module(test main.cpp)
target_link_libraries(test PRIVATE Qt6::Widgets)

Console output

-- pybind11 v3.0.0 
-- Found Python: /home/tipbs/.pyenv/shims/python3 (found suitable version "3.13.5", minimum required is "3.8") found components: Interpreter Development.Module Development.Embed
Using compatibility mode for Python, set PYBIND11_FINDPYTHON to NEW/OLD to silence this message
-- Found Python: /home/tipbs/.pyenv/shims/python3 (found version "3.13.5") found components: Interpreter
-- Configuring done (0.4s)
-- Generating done (0.0s)
-- Build files have been written to: /home/tipbs/py_qt_test/build
[  0%] Built target test_autogen_timestamp_deps
[ 25%] Automatic MOC and UIC for target test
[ 25%] Built target test_autogen
[ 50%] Building CXX object CMakeFiles/test.dir/main.cpp.o
Dans le fichier inclus depuis /home/tipbs/py_qt_test/build/_deps/pybind11-src/include/pybind11/attr.h:13,
                 depuis /home/tipbs/py_qt_test/build/_deps/pybind11-src/include/pybind11/detail/class.h:12,
                 depuis /home/tipbs/py_qt_test/build/_deps/pybind11-src/include/pybind11/pybind11.h:12,
                 depuis /home/tipbs/py_qt_test/main.cpp:1:
/home/tipbs/py_qt_test/main.cpp: In function « PyObject* PyInit_test() »:
/home/tipbs/py_qt_test/main.cpp:6:1: erreur: expected unqualified-id before « = » token
    6 | PYBIND11_MODULE(test, m) {
      | ^~~~~~~~~~~~~~~
/home/tipbs/py_qt_test/main.cpp:6:1: erreur: expected primary-expression before « . » token
    6 | PYBIND11_MODULE(test, m) {
      | ^~~~~~~~~~~~~~~
make[2]: *** [CMakeFiles/test.dir/build.make:93: CMakeFiles/test.dir/main.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:112: CMakeFiles/test.dir/all] Error 2
make: *** [Makefile:91: all] Error 2