Minecraft wiki entry for Development_versions, associated text: MC-237925 – Opening world from 1.12.2 (or older) in latest snapshot regenerates random chunks.
MC-237933 – Sweet berries generate much too often.
MC-237950 – Cave vines can generate without tip because prioritize_tip option is negated.
MC-237951 – Cave vines can generate into water.
MC-237962 – Entities bob their head up and down when targeting towards the player.
MC-238104 – Blue orchid generation has decreased.
MC-238265 – version.json contains internal revision ID instead of game version ID.