**Describe the bug** The `HasKeys` configuration parameter for [flusher_kafka_v2](https://observability.cn/project/loongcollector/flusher-kafka-v2/) to specify partitions is invalid. The bug was introduced by this commit: https://github.com/alibaba/loongcollector/commit/a1019fd9552649f4122ddd8ba9fc8bee3f5e995b. <img width="1110" height="326" alt="Image" src="https://github.com/user-attachments/assets/ce92118c-4488-438b-be78-acb1fd686056" /> **iLogtail Running Environment** - ilogtail version: [v3.0.11](https://github.com/alibaba/loongcollector/releases/tag/v3.0.11)