Logstash kafka input consumer group not finding all partitions

I have a topic with two partitions but logstash consume only one of them.
"Adding newly assigned partitions: partition-0", it is missing the other partition. And when I delete my logstash pod (I'm on kubernetes) it randomly assigns a partition.

this is my input configuration:

input {
     kafka {
       bootstrap_servers => "X"
       topics => "topic-x"
       consumer_threads => 1

Can someone help fix this?
Thank you in advance

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