Lack of support for a non standard no-referrer policy value in Blink in Google Chrome prior to 64.0.3282.119 allowed a remote attacker to obtain referrer details from a web page that had thought it had opted out of sending referrer data.
https://access.redhat.com/errata/RHSA-2018:0265
https://chromereleases.googleblog.com/2018/01/stable-channel-update-for-desktop_24.html