Minecraft wiki entry for Development_versions, associated text: MC-106056 – Can trade with /summon-ed green villagers (nitwit) only once per villager
MC-106058 – Villager converted from zombie has random trades from random profession.
MC-106064 – Some non-nitwit villagers have no trades
MC-106075 – Hopper timings depend on the gametick they're activated in.
MC-106099 – Firework Rocket does not spawn
MC-106165 – Mob Potion effects are inflicted through shields
MC-106302 – Unable to name saddled pigs