Minecraft wiki entry for Development_versions, associated text: MC-242016 – Dripstone doesn't generate at high y values.
MC-242022 – Game crashes when loading new chunks (Exception generating new chunk, caused by ArrayIndexOutOfBoundsException: Index 268435455 out of bounds for length 32).
MC-242479 – Pointed dripstone makes holes in lava pools.
MC-242520 – Horses, Donkeys and Pigs float above water when dismounted underwater.