Minecraft wiki entry for Development_versions, associated text: MC-248539 – /locate command not working properly in Flat worlds.
MC-248618 – Every time a resource pack is reloaded, gameplay timers and notices reload.
MC-248636 – The game output and server console are logged and spammed with "Creating a MIN function between two non-overlapping inputs" when joining or creating a world.
MC-248637 – Crash when opening singleplayer screen due to StackOverflowError in net.minecraft.nbt.CompoundTag$1.skip.
MC-248680 – The world freezes on Superflat when using the /locate command to find a pillager outpost.