Custom actions to filter junk mail arriving in Junk mailbox aren't executed

I receive a lot of junk mail that is sent to hms92@mac.com. I’ve found that I can set up a rule based on the Original-Recipient header that matches with “rfc822:hms92@mac.com” to delete most of these emails. This rule works perfectly when invoked manually. What I would like to do is have these emails sent to the trash *before* they arrive in my Junk folder. This should be possible, because according to Mail > Settings > Junk Mail, if I set up a custom action with this rule (and with the setting checked “Filter junk mail before applying my rules”), I would expect the very same rule configured as a custom action to do this. However, it doesn’t work. The spam with this Original-Recipient header “rfc822:hms92@mac.com” arrives normally in my Junk folder without being sent to the Trash or deleted. Do custom actions work for anyone? I've filed FB12213605 with Apple.