Mob drop problems:

• Enchanted items used by mobs seem guaranteed to drop.
• Drowned will always drop anything held in both their main hand and off-hand.
• Chickens drop feathers less often.
• Dungeons are suddenly everywhere.

Smaller problems:

• Drowned hold tridents backwards again.
• When playing split-screen with 3-4 players, all crosshairs will flicker randomly and occasionally disappear completely (usually fixed by opening the inventory for a few seconds).
• If standing too close to a block when placing it, it will very rarely disappear a split second later and the block will not leave the inventory. This has been happening for years.
• Offline worlds will occasionally have major lag issues for minutes at a time.
• Villagers won't go inside when chased by hostile mobs (not sure if this one is actually a bug).
• When drowning, the damage will sometimes stop for a few seconds (unsure if this one's a bug too).
• Shields will occasionally be held completely wrong, but appear fine in the image of the character in the top left.