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SpamAssassin to blacklist and unblacklist

SpamAssassin has a feature to blacklist and unblacklist certain e-mail addresses. But recently I noticed something interesting that may need some more investigation. I have all addresses for domain example.org blacklisted, but also unblacklisted certain functional addresses as is shown in the example below.

blacklist_from          *@example.org
unblacklist_from        abuse@*
unblacklist_from        hostmaster@*
unblacklist_from        postmaster@*
unblacklist_from        security@*
unblacklist_from        webmaster@*

Now I expected that webmaster@example.org was going to be unblacklisted, meaning the mail would have both a spam score of both +100 and -100 making it effective 0 again. This modification resulted in a spam score of +100 and makes me worry that unblacklisting will demand that the domain part needs to be specified instead of having a wildcard. This will require some more testing in the near future, but for now, it may affect other installations.