Minecraft wiki entry for Development_versions, associated text: MC-147041 – Fletchers drop uncraftable tipped arrows for their gift (hero of the village loot table).
MC-147060 – Client freezes if a nearby player swims in water while flying with elytra.
MC-147099 – "Creating buffer: Invalid enumerated parameter value" spammed in log
MC-147152 – Invalid move player packet received / teleporting player to NaN crashes worldsave.