Upstream has released updates that appear 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:
4d37bf30 PR-762: Add SpawnReason and TransformReason for Tadpole metamorphosis into Frog
788174ae PR-761: Add Hangable interface to MangrovePropagule
CraftBukkit Changes:
3571ca8d1 PR-1070: Add SpawnReason and TransformReason for Tadpole metamorphosis into Frog
8f097b92f PR-1068: Add Hangable interface to MangrovePropagule
Spigot Changes:
56be6a84 Rebuild patches
c6c8886d PR-118: Add config option to disable hopper-chunk-loading
