Minecraft wiki entry for Development_versions, associated text: MC-137565 – Cod and cooked cod item uses old texture
MC-138043 – Poppy textures has spines
MC-138337 – Mobs don't spawn above highest generated block
MC-138566 – Barrels facing south have a rotated front texture
MC-138709 – Tuxedo cat texture issue
MC-139183 – New command block textures
MC-139270 – Loading structures with less than full structure integrity loads nothing or everything
MC-139401 – Pistons are no longer (redstone) transparent
MC-139497 – Can't place rails, redstone, and other blocks that need a solid block below on Soulsand
MC-139678 – Fish are no longer spawning in water.