Fix lag caused by water lighting updates
Before: http://aikar.co/timings.php?url=7842564
After: http://aikar.co/timings.php?url=7842536
Update from upstream SpigotMC
No need to wait for the conversation to finish SpigotMC/Spigot@67b502b6f8d5c8c98419a7a25398ef7cacc866fe