`--pyargs` test discovery still fails in frozen application

I saw that #11511 is closed, to I tried it out, trying to package tests into a frozen app. Unfortunately, I now get

ERROR: module or package not found: myapp.test (missing __init__.py?)

pytest 9.1.1 with pyinstaller 6.21.0 on Windows 11.

MWE:

myapp\test\test_example.py

def test_example():
    assert 1 + 1 == 2

myapp\test_init_.py

myapp_init_.py

main.py

import sys

import pytest

if __name__ == "__main__":
    sys.exit(
        pytest.main(
            ["-o", "consider_namespace_packages=true", "--pyargs", "myapp.test"],
        )
    )

myapp.spec

from PyInstaller.building.api import COLLECT, EXE, PYZ
from PyInstaller.building.build_main import Analysis
from PyInstaller.utils.hooks import collect_submodules

a = Analysis(
    ["main.py"],
    hiddenimports=["myapp", "myapp.test", *collect_submodules("myapp.test"), "pytest"],
)
pyz = PYZ(a.pure)
exe = EXE(pyz, a.scripts, [], name="myapp")
coll = COLLECT(exe, a.binaries, a.datas, name="myapp")

pyproject.toml

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

[project]
name = "myapp"
version = "0.1.0"

[tool.pytest.ini_options]
consider_namespace_packages = true

run.bat

@echo off
pytest
python main.py
pyinstaller myapp.spec --clean -y
dist\myapp\myapp.exe

Reproduce the failure with main.py, myapp.spec, and run.bat using pytest 9.1.1 and PyInstaller 6.21.0 on Windows. Start at the --pyargs discovery path for the frozen executable and compare it with normal pytest discovery. Done means the packaged application locates myapp.test and runs test_example successfully.