Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
333b9f02 SPIGOT-5422: Add support for 3-dimensional biomes
170d7386 Fix bad link in deprecated FlowerPot MaterialData class
CraftBukkit Changes:
16dc5758 SPIGOT-5449: Fix issue with projectiles
fd25653f SPIGOT-5448: Shulker Boxes collapse empty slots when picked up
b97d581a SPIGOT-5443: BEE_NEST BlockState
73698cf8 SPIGOT-5442: Fix issue with fire charges
beff9fb9 SPIGOT-5437: Fix CustomChunkGenerator.CustomBiomeGrid ignoring the y value for biomes
f777640e SPIGOT-5425: Prevent empty/air loot (again?)
db0dafb1 SPIGOT-5422: Add support for 3-dimensional biomes
4633e6c5 Fix crash with disabled worlds
Spigot Changes:
f39a89ef SPIGOT-5423: Remove covariant type change to give better chance of Java downgrades working
