Minecraft wiki entry for Development_versions, associated text: MC-44055 – Game fails to switch the audio output from one device to another from the title screen after the game has started.
MC-128762 – Strongholds do not generate in ocean buffet worlds.
MC-136288 – Strongholds don't generate in swamp biomes.
MC-158410 – Strongholds don't generate in beach surface and snowy beaches buffet worlds.
MC-183184 – Sprinting stops as soon as you touch another block.
MC-202036 – Adding a biome to a datapack shifts biome IDs in existing chunks.