Observers that look at powered redstone dust update upon login

Hoppers unlock for one tick upon login (may be an observer issue)

Attacking with a Sword in Creative mode causes jarring movements

Tipped Arrows convert to Uncraftable Arrows when shift-clicked into an Enchantment Table

The 1st and 2nd slots of the Enchantment Table cannot be used

Mobs do not spawn from upgraded superflat worlds

Procedurally generated bells in villages do not connect to blocks correctly

Trident doesn't show enchantment glint

Having a block in the Player's feet forces through the floor

Mobs do not track onto waterlogged blocks and just avoid them. (e.g: mobs do not walk across slab bridges)