CWM Bug: Rules Applied To Lists Fail Badly

Here's the input file:-

[[[
@prefix : <#> .
@prefix daml: <http://www.daml.org/2001/03/daml+oil#> .
@prefix log: <http://www.w3.org/2000/10/swap/log#> .

this log:forAll :x , :y , :z .

:a :b :c .
:l :m :n .
:p :q (:r :s) .

{ :x :q [ daml:first :y; daml:rest [ daml:first :z ] ] }
   log:implies { :p :qfirst :y; :qrest :z } .
]]]

the latest version of CWM gives the following:-

[[[
    :p     :q  (
        :r
        :s  );
         :qfirst :r,
                :y;
         :qrest :r,
                :s,
                :z .
]]]

where two things seem to be going wrong at once: unbound variables are
getting output (:y, :z), and false results are being concluded (:qrest
:r).

In version 1.82 of CWM, I get the following output:-

[[[
    :p     :q  (
        :r
        :s
         ) .
]]]

I.e. the rule isn't applied at all. When I convert the rest input list
to ":p :q [ daml:first :r; daml:rest [ daml:first :s; daml:rest
daml:nil ] ] .", I get the same results.

--
Kindest Regards,
Sean B. Palmer
@prefix : <http://purl.org/net/swn#> .
:Sean :homepage <http://purl.org/net/sbp/> .