看到 1.21-rc1 snapshot 小兴奋，把1.20.6的数据包拖过去，发现全完蛋，什么都失灵，连最简单的 recipe 都不好用了。

又下载了别人做的 24w18a (for 1.21) 的数据包，也不好用，直接懵圈。

折腾一天，终于发现原来是数据包文件夹命名改了：

• In snapshot 24w21a (for 1.21) some registry types that used legacy datapack directory names (based on plural name of element) have been renamed to match registry name. Affected directories:

  • structures -> structure

  • advancements -> advancement

  • recipes-> recipe

  • loot_tables -> loot_table

  • predicates-> predicate

  • item_modifiers -> item_modifier

  • functions -> function

  • tags/functions -> tags/function

• In snapshot 24w19a (for 1.21) tag directories were also renamed.

  • tags/items -> tags/item

  • tags/blocks -> tags/block

  • tags/entity_types -> tags/entity_type

  • tags/fluids -> tags/fluid

  • tags/game_events -> tags/game_event