When creating multiple brokers at the same IP, corresponding to multiple hosts and multiple Kerberos principals, librdkafka can only auth one broker.

[EunhaTaker]

version: v2.3.0; v2.6.1
broker: Configured with Kerberos authentication, three broker nodes are on the same device with the same IP but different hosts. The hosts are as follows: 172.18.0.1 kafka1 kafka2 kafka3. Separate Kerberos principals have been created based on these three hosts and have been applied to the brokers respectively.
producer: Since kafka1 is listed first in the hosts configuration, librdkafka only attempts to authenticate with the principal: xxx/kafka1@XXX.COM, which results in messages being sent only to the partitions corresponding to kafka1 (I am very sure about this).
The performance of kafka-console-producer.sh is correct; it can authenticate with all brokers and send to any partition. Do I need some configuration? Or is this a bug?
My code is on a local network, and I am not allowed to copy it. Please forgive me for not being able to post my configuration. Additionally, this text is machine-translated.