UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/68.0.3440.75 Chrome/68.0.3440.75 Safari/537.36

Steps to reproduce the problem:
1. Open Url https://revoked-demo.pca.dfn.de/

What is the expected behavior?
There should be warning that the certificate is (no longer) valid as it has been revoked.

What went wrong?
There is no warning and a green lock is shown indicating that the certificate is valid instead of the expected:
Your connection is not private
Attackers might be trying to steal your information from attacker.example.com (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_AUTHORITY_INVALID

Did this work before? N/A 

Chrome version: 68.0.3440.75  Channel: stable
OS Version: Ubuntu 18.04
Flash Version: 

Firefox 61.0.1 works as expected.

The translation for the German page content is:
This web server uses uses a certificate that was revoked for demonstration purposes. It is therefore invalid. Consequently,
if you can read this web page without a warning in your browser your browser failed to check the validity of the certificate.

The DFN ("German Research Network") provides internet infrastructure for German universities and research institutes and
it signs their certificates.