APPEND_SLASH doesn't work for me with Django 4

Question

Django version 4.0.2

settings.py

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]
APPEND_SLASH = True

project's urls.py

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('poolapp.urls')),
]

app's urls.py

urlpatterns = [
    path('index/', index, name="index"),
]

With the same configuration, If I visit 127.0.0.1/index , Django 3.x redirects me to 127.0.0.1/index/ .

Django 4.0.2 returns 404.

Did something change with Django 4.x?