Function Input not Evaluated in Query Rules

I could easily be missing something, but to my current understanding, the intended behavior between the two code snippets below should be identical.

(d/q '[:find ?int
       :in ?intersection
       :where [(?intersection #{:a :b :c} #{:c :d :e}) ?int]]
     clojure.set/intersection))
;; => #{[#{:c}]}

(d/q '[:find ?int
       :in % ?intersection
       :where (intersection-rule #{:a :b :c} #{:c :d :e} ?int)]
  '[[(intersection-rule ?s ?t ?int)
     [(?intersection ?s ?t) ?int]]]
  clojure.set/intersection))
;; => Execution error (ExceptionInfo) at datascript.query/bind-by-fn (query.cljc:546). 
;;    Unknown function '?intersection__auto__1 in [(?intersection__auto__1 #{:c :b :a} #{:e :c :d}) 

Start at query.cljc:546 in bind-by-fn and reproduce the two query snippets from the issue. Trace why the rule form reports an unknown function while the direct form succeeds; done means function input in query rules behaves consistently with the direct query without that error.