Minecraft wiki entry for Development_versions, associated text: MC-56970 – Leaves show x-ray effect on fast graphics.
MC-128066 – Highly transparent block edges on ice, slime block and honey block.
MC-147591 – Cat type "Jellie" doesn't spawn in villages upon world generation.
MC-148794 – Guardians are not spawning in preset "Floating Island".
MC-148802 – Pillager don't spawn around outpost with the floating island generation.
MC-152001 – Zombie villages never spawn with baby zombie villagers.
MC-166260 – Light from fire that has gone out lingers at the border of chunks.
MC-172650 – Ice side texture does not appear underwater.