http://breezewiki.catsarchywsyuss6jdxlypsw5dc7owd5u5tr6bujxb7o6xw2hipqehyd.onion/minecraft/wiki/Java_Edition_removed_features
Beyond this 32 million limit, blocks would no longer exist at all, and give way to an empty void. When major changes to world generation brought the Far Lands much closer to the world origin later that same month, however, the world boundary still remained at 32 million, meaning the Far Lands were completely possible to reach without modding the game.