Interaction between overrides and translations in Pyramid – difference with and without config.begin()

app:__init__.py

from pyramid.config import Configurator

config = Configurator()
config.begin()
config.override_asset('framework', 'app:framework-overrides/')
config.commit()
config.add_translation_dirs('framework:locale')

output

With config.begin() (line 4 in app/__init__.py):
  pyramid.exceptions.ConfigurationError: "/home/piotr/projects/pyramid/repro2/app/framework-overrides/locale" is not a directory
Without config.begin() (line 4 in app/__init__.py):
  pyramid.exceptions.ConfigurationError: "/home/piotr/projects/pyramid/repro2/app/framework/locale" is not a directory

tree

app
├── framework
│   ├── __init__.py
├── framework-overrides
├── __init__.py