Blocking .biz websites + Failed Test Codes: [‘10500AU-BL’]

Hello,

I have been testing a false positive and noticed the plugin seems to block comments when the website field contains a valid .biz website (i.e domain.tld = example.biz)

When I compare the comment logs I notice the blocked .biz websites have the following error:
Failed Test Codes: [‘10500AU-BL’]

The error presented to the user attempting to submit the valid comment is:
ERROR: Your comment appears to be spam.

Please go back and check all parts of your comment submission (including name, email, website, and comment content).

Testing was performed on several WordPress 4.7.3 sites with the 2017 theme and just the WP-SpamShield Plugin activated.

I did not see anything in the configuration or documentation referring to the blocking of specific .tld’s – did I miss something?

Thanks