ICMPv6 test for ipV6

Description of the issue:
On brave beta and brave browser until recently I scored 19/20 on this website check for ipV6 use :

It is now showing a score of 17/20

It refers to a firewall problem BUT on testing Chromium and Dissenter browsers they still show me a score of 19/20 . This is with my existing firewall settings. Dissenter is also brave based.

How can this issue be reproduced?

  1. Reset all browser settings
  2. Turn off all extensions
  3. Remove cookies
  4. Restart browser

Expected result:

Nothing I have tried will improve my score

Brave Version( check About Brave):
Version 1.15.61 Chromium: 86.0.4240.42 (Official Build) beta (64-bit)

Additional Information:

Can anyone suggest a setting to change or a reason for this drop in score because of a brave browser update reason or setting change please ?