Similar to the above mentioned bug. Game crashes. No snapshot, sorry

Following this update the game became sporadically laggy. 

all the toggle buttons in the settings were on for experimental etc. 

Interesting, Each time I tried to cure a villager and crashed, upon restarting game each time, a previously cured villager disappeared. 

Just previous to when the first crash happened I had set up a kelp redstone and broke it by opening the chest before switching it off. Perhaps this led to the crash as up until this all good. 

Keep up the good work Mojang... Looking forward to when it finally works...