Thes are some of bugs I encountered:

Iron Golems wiggles and swings its feet so much when running or dragged with lead.

Speed of breaking some objects with tools like: soul soil can't be instantly break with shovel, new nether objects or blocks can't be instantly break with some tools. 

Fortune enchanted pickaxe won't drop extras on ores like diamonds, coal, etc.

Observer can't detect melon or pumpkin plant when it gives fruit.