I've even verified it using SA's own debug output with -D rbl=-64.
I've gone ahead and created a bug, and attached a sample email demonstrating the issue so that the developers can fix it when they get a chance.
You can monitor the progress of the bug here:
http://bugzilla.spamassassin.org/show_bug.cgi?id=2543
In the interim, I'd recommend disabling the rule by adding the following to your local.cf (don't forget to remove it when you upgrade to a fixed version)
score RCVD_IN_DYNABLOCK 0
Personally, I'm using a score of 0.01, so that I can monitor what email it matches, but it's a waste of a DNS lookup for most people.
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