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:
60268ac8 Recipe choice lists should be copied once handed over to Bukkit
7ab335f2 Consistent multiple choice APIs for RecipeChoice.
2b6f3d7f SPIGOT-4586: Change PotionEffectType#value to not include null
CraftBukkit Changes:
2aba349f Need to update item in hand if fish bucket pickup cancelled
b634e059 SPIGOT-4591: Must mark itemstacks as dirty in case the handle itself changed
1748af89 Consistent multiple choice APIs for RecipeChoice.
Shane Freeder