Clojurians Log v2

I’m a little confused. I’m using 0.14.1 and I’m trying to use :initialize-context. Based on the wording of the feature, “Values can be added to the context at the beginning of the execution flow using the :initialize-context action.”, I would have thought the no-op would be (fn [ctx] ctx) but all my tests start returning 500s. If I switch :initialize-context to be a map literal {:a 1}, everything works again. Am I doing this right?