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### Bug Fixes - Fixed `ExceptionInInitializerError` when players join the server on MC 1.21.4. The mixin was calling `add()` on an immutable `List.of()` from `CustomPayloadS2CPacket`'s configuration codec initialization, causing `UnsupportedOperationException`. All `@ModifyArg` handlers now create a mutable `ArrayList` copy before adding entries. --- ### 修复 - 修复 MC 1.21.4 中玩家加入服务端时抛出 `ExceptionInInitializerError` 的问题。mixin 直接对 `CustomPayloadS2CPacket` 配置 codec 初始化时创建的不可变 `List.of()` 调用 `add()`，导致 `UnsupportedOperationException`。所有 `@ModifyArg` 处理器现在会先创建可变 `ArrayList` 副本再添加条目。