When entering commands in the chat field, if you enter hiragana, the characters of the commands you have entered will be shifted by one character. This bug occurs in the preview version, and also occurs when entering command blocks. Also, I don't know if this is a bug or a feature, but I can no longer put armor on villagers. In past versions, it was possible to put armor on villagers using a dispenser, but as of 1.20.15, armor can only be put on by command. Additionally, there is a bug where if you apply an evil villager's flag pattern to an enchanted shield, the enchantment will be removed. Also, after defeating the Ender Dragon, it normally disappears while rising upwards, but in recent versions there has been a bug where it stays in place and disappears.