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
CraftBukkit Changes:
eb2e6578 SPIGOT-5116: Fix concurrent modification exception inside ChunkMapDistance
989f9b3d SPIGOT-4849: Fix server crash when accessing chunks during chunk load/unload/populate events
f554183c SPIGOT-5171: Don't fire PlayerTeleportEvent if not actually moving
2349feb8 SPIGOT-5163: Cancelling PlayerBucketFillEvent visually removes the targeted block
Spigot Changes:
9a643a6a Remove DataWatcher Locking
--- work/Bukkit
Submodule work/Bukkit aba2aaaf..949124e0:
> SPIGOT-5121: Method to set PierceLevel of arrows
--- work/CraftBukkit
Submodule work/CraftBukkit c6997924..bf329334:
> SPIGOT-5133: Throwing items into secondary end world portal causes crash
> SPIGOT-5121: Method to set PierceLevel of arrows
> SPIGOT-5122: Skip world#notify if sign has no world.
> SPIGOT-5105: The EntityTag nbt tag disappears from preset armor_stand items.
> SPIGOT-5106: Config option to prevent plugins with incompatible API's from loading
--- work/Spigot
Submodule work/Spigot 595711b0..935adb34:
> SPIGOT-5088: Additional growth modifiers
