Is clojure.spec check generating bad input?

Using clojure.spec (org.clojure/clojurescript {:mvn/version "1.10.520"}), I have a function spec that specifies a map for its input.

gen/generate and gen/sample work fine. But calling cljs.spec.test.alpha/check errors with input that should be a map, but is passed a collection (Error: More than one element found in structure). Ie, it looks like the spec system is generating bad input.

Is this a bug with spec?

bar spec

(s/def ::check-run
  (s/keys
    :req-un
    [::action
     ::check_run
     ::installation
     ::organization
     ::repository
     ::sender]))

foo.cljs

(s/def ::payload :bar/check-run)
(s/def ::check-run-started (s/keys :req-un [::payload]))

(s/fdef check-run->cijob-created
  :args (s/cat :arg ::check-run-started))

(defn check-run->cijob-created [arg])

While the function spec only declares A, the spec system is generating B.

;; A
{:payload {:action "", :check_run {:html_url "", }}, ...}

;; B
[({:payload {:action "", :check_run {:html_url "", }}, ...}})]

workbench

(cljs.spec.test.alpha/check
  `foo/check-run->cijob-created
  {:clojure.spec.test.check/opts {:num-tests 10}})


[{:spec #object[cljs.spec.alpha.t_cljs$spec$alpha50916],

  :clojure.spec.test.check/ret
  {:shrunk
   {:total-nodes-visited 313, :depth 148, :pass? false, :result #object[Error Error: More than one element found in structure: 0], :result-data #:clojure.test.check.properties{:error #object[Error Error: More than one element found in structure: 0]}, :time-shrinking-ms 11299,
    :smallest
    [({:payload {:action "", :check_run {:html_url "", }}, ...}})]},

  :sym foo/check-run->cijob-created,
  :failure #object[Error Error: More than one element found in structure: 0]}]


  [1]: https://clojure.org/about/spec