Minecraft wiki entry for Development_versions, associated text: MC-171020 – New Nether biomes do not work properly in buffet worlds.
MC-175288 – Creating a warped forest superflat world with decorations freezes.
MC-175919 – Villagers sometimes stop farming.
MC-177136 – All compasses and lodestone compasses point to the same target, regardless of what type of compass it is.
MC-177238 – Windows symbolic link in saves/ is no longer followed as of 20w14a.
MC-177253 – Running a set_attributes function throws java.lang.NullPointerException if it contains an undefined attribute.
MC-177316 – Lodestone compass in item frame does not update after turning.
MC-177462 – Respawn anchor explodes client side.