It's written "container.minecart" in the inventory of minecart hopper & chest.

If you break a minecart hopper, the minecart you get is named "container.minecart"

The potion tab of the creative inventory is weirdly-arranged

You can't use a fishing rod if you hold it with your off-hand.

"Fish trails" in the water don't reach the hook.

Hook have weird and constant particles above them while fishing

Hooks float above water while fishing

If you try to take again the leashes attached to a fence, the leashes break.

Using 6 blocks,you can only craft 4 stairs.