Minecraft wiki entry for Development_versions, associated text: MC-49010 – Cloning pressure plates or buttons whilst they're activated keeps them pressed forever.
MC-131930 – Deep warm ocean generates without coral and sea pickles.
MC-156616 – Badlands layers not generating properly.
MC-217379 – Pufferfish don't spawn in deep warm ocean.
MC-224205 – Cloned big dripleaves remain tilted forever when their tilt value is not equal to "none".
MC-228745 – Big dripleafs can't be supported by farmland.
MC-238073 – Decorators are independent of world seed.