Minecraft wiki entry for Development_versions, associated text: MC-131346 – It's possible to place buckets of water, lava or fish in adventure mode.
MC-132063 – Stone item appears when resizing window.
MC-133098 – Loading a world with a corrupted stats file crashes the game.
MC-133127 – Drowned from ocean ruins never spawn with a trident, a nautilus shell or a fishing rod.
MC-134702 – Fish spawned from buckets count towards the aquatic mob cap.
MC-135816 – Trident does not return uppon reload of world.
MC-135857 – Beacon effect icon doesn't have a blue edge if it overwrites a potion effect.
MC-135893 – Upgrading from 1.12.2 to a newer version will cause trapped chests placed in 1.12.2 and earlier to stop triggering redstone through the floor.