pf, rdr, & anchors - broken or PEBKAC

[Derek (freebsd lists)]

Hi!

I'm trying to configure a basic layer-3 load balancer 
(10.2-RELEASE).  I initially started down this path with relayd 
from ports, as it seems to do what I need, very succinctly.

What I've stumbled upon - I hope - is me not knowing how to cause 
rdr statements in anchors to be evaluated, although it appears 
that this functionality is currently broken.

Take this contrived, most-trivial example (where 192.168.0.1 is 
external, and 10.2.2.251 is internal):

/etc/pf.conf:
rdr inet proto tcp from any to 192.168.0.1 port http -> 10.2.2.251

sudo pfctl -Fa -f /etc/pf.conf

*everything works as expected*

Now, this time using anchors:

sudo mv /etc/pf.conf /etc/pf.conf-anchor

/etc/pf.conf:
anchor testing
load anchor testing from "/etc/pf.conf-anchor"

sudo pfctl -Fa -f /etc/pf.conf

gives TCP RSTs when connecting to port 80.  Additionally

sudo pfctl -a testing -vvs nat:
@0 rdr inet proto tcp from any to 192.168.0.1 port = http -> 
10.2.2.251
   [ Evaluations: 0         Packets: 0         Bytes: 0 
  States: 0     ]
   [ Inserted: uid 0 pid 56764 State Creations: 0     ]


So identical rulesets, one loaded as an anchor: never evaluated, 
the other loaded into the main ruleset directly: works fine.

Is this broken, or am I missing something?

Thanks!
Derek