ansible-playbook still doesn't report error if the inventory file doesn't exist

In the issue #15035 described the desired behaviour of ansible-playbook in case if an inventory file is missing.
According to the status of this issue it has beein implemented in the version 2.4.
Also I find the appropriate infotmation in the documentation of ansible 2.4

So far, so good, bug I was not able to make ansible-playbook to throw any fatal error, regardless of the environment variable ANSIBLE_INVENTORY_UNPARSED_FAILED or the config setting unparsed_is_failed.
See also my newly created issue #36034.

To my surprise it was closed with the statement that a warning in the outcome is good enough.
This seems to cut across the ansible documentation.

Does anybody know if this feature was indeed implemented and probably has been reverted in one of the following ansible versions?
I tried it with version 2.4.3 and the last one from devel (2.6).
If this has been implemented - how can I configure ansible to throw a fatal error in the described situation?

Thanks in advance!

Alexej

reopened, the toggle should be working.