Minecraft wiki entry for Development_versions, associated text: MC-102052 – Structure blocks do not save properly.
MC-102068 – fallingdust Particle doesn't seem to work.
MC-102069 – Bone block is handled as a transparent block.
MC-102085 – Polar bears get stuck in standing position.
MC-102091 – Block hitbox/F3 crosshair issues.
MC-102103 – Savanna village blacksmith buildings burn themselves down.
MC-102125 – AreaEffectCloud with fallingdust particle crashes client "Exception while adding particle".
MC-102209 – Structure blocks melt snow.
MC-102238 – Surface-level abandoned mineshafts generate outside mesa and its variants.