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The furnace's fuel button doesn't work and you can't get items back from the furnace!

Nether portals don't work, they work when teleporting to the nether, but when teleporting back into the overworld, it makes a new nether portal elsewhere!

Letters do not fly from nearby bookshelves to an enchantent table

Wolves can go through/into blocks, especially chests and crafting tables

Zombies sometimes drop iron, potatoes and carrots when killed...