When a player's generic.step_height attribute is set to more than two, attempting to step atop of more than two blocks may fail if there are blocks higher up

/data modify on the elements of an empty list adds a tag to the list

Entity selectors in /say commands are no longer evaluated

Several advancements use multiple criteria instead of the new "items" format

'player' sub-predicate of 'entity_properties' predicate only passes if game mode is specified

If a custom biome uses multiple configured structure features of the same type, only one of them can generate

Clicking on a redstone ore does not trigger the "minecraft:item_used_on_block" advancement trigger

Text component formatting (e.g. italics, color, fonts) is not displayed in entity names

`location_check` dimension tests fail when the executing position is not loaded

Bamboo sapling is not in the #minecraft:saplings block tag

Invalid block tags prevent world from loading

Using /data merge on a structure block to change its rotation/mirror does not update the way the structure is loaded until the world is reloaded

Levitation effect resets its amplifier to 0 when quitting and reloading a world

I can't get back to 1.12 or 1.12.2 after opening 17w43a

Using /function in chat returns errors regardless to the gamerules sendCommandFeedback and commandBlockOutput

@e does not select players after teleporting

Selector '@e' found nothing

Superflat preset makes the game crash

Item names do not render in droppers

Armour stand on leash knot crashes the game