Minecraft wiki entry for Development_versions, associated text: MC-165959 – Incorrectly sized textures cause mipmap levels to drop.
MC-166004 – Getting too close to an end gateway causes the game to crash.
MC-166068 – Default texture of minecraft:entity/conduit/open_eye causes mipmap level to drop from 4 to 3 when using the Programmer Art texture pack.
MC-166097 – The maximum height of 1×1 jungle tree is 10 instead of 12.