`(s/gen ...)` caches its failure to load generators and thus is incompatible with `add-lib`

Question

Clojure 1.12.0
user=> (require '[clojure.spec.alpha :as s])
nil
user=> (s/def ::x #{1 2 3})
:user/x
user=> (s/gen ::x)
Execution error (FileNotFoundException) at user/eval145 (REPL:1).
Could not locate clojure/test/check/generators__init.class, clojure/test/check/generators.clj or clojure/test/check/generators.cljc on classpath.
user=> (add-lib 'org.clojure/test.check)
[org.clojure/test.check]
user=> (s/gen ::x)
Execution error (FileNotFoundException) at user/eval145 (REPL:1).
Could not locate clojure/test/check/generators__init.class, clojure/test/check/generators.clj or clojure/test/check/generators.cljc on classpath.