Minecraft wiki entry for Development_versions, associated text: MC-165605 – Command starting with / in command block shows error but still works.
MC-165606 – "Bee Our Guest" advancement is only triggered when more than one bottle is in the players hand while right-clicking the hive.
MC-165611 – Enchantment glint does not render in boat interior.
MC-165627 – Falling blocks glitch through shulkers when the shulker is opening/closing.
MC-165667 – Hitbox of entities is not rendered through transparent blocks when viewing from certain angles
MC-165676 – Aquatic mobs do not move below sea level.
MC-165727 – Falling blocks on top of non-full block without block below do not break.
MC-165789 – Under certain circumstances mob body parts don't render underwater.
MC-165876 – Sand particles do not have gravity anymore.