Channels with transducer using reduced don't work as intended

(def ch (chan 1 (take 2)))

(put! ch 1)
(put! ch 2)
(put! ch 3)

(take! ch identity)

ClassCastException clojure.lang.PersistentVector cannot be cast to java.util.concurrent.locks.Lock clojure.core.async.impl.channels.ManyToManyChannel (channels.clj:55)

This does not happen if a take is made before the first put so that the buffer size fits. The problem doesn't seem to be related only to the buffer size though.

(def ch (chan 1 (take-while true?)))

(put! ch true)
(put! ch false)
(put! ch false)

(take! ch identity)

ClassCastException clojure.lang.PersistentVector cannot be cast to java.util.concurrent.locks.Lock clojure.core.async.impl.channels.ManyToManyChannel (channels.clj:55)