Steps:

1. Login to storefront as some user e.g. admin.
2. Add product to cart.
3. Go to checkout and buy it.
4. Log out.
5. As anonymous add product to cart.
6. Click Go to checkout button.
7. Login page appears (anonymous has no permission to checkout) - login as admin.

Result: 404 error appears 

Could not find 'Ibexa\Cart\Value\Cart' with identifier '300759a1-85fc-40e8-98d4-7d255236d83a'