Why I cannot receive CPU data when using SNMP and logstash - logstash

Question

there
I monitor remote Linux with Logstash and SNMP. When I try to get interfaces or ifSpeed, everthing is OK. But when I try to get sysDescr, CPU storage and memory storage, I　cannot get any data back!
I dont know why. The logstash log seems normal, too.
The logstash.conf:
input {
snmp {
tables => [
{
"name" => "sysDescr"
"columns" => ["1.3.6.1.2.1.1.1.0"]
}
]
hosts => [{
host => "udp:192.168.131.125/161"
community => "laundry"
version => "2c"
}
]
interval => 5
type => "snmp"
}
beats {
port => 5044
add_field => {"type" => "beat"}
}
tcp {
port => 50000
}
}
## Add your filters / logstash plugins configuration here
output {
if [type] == "beat" {
elasticsearch {
hosts => ["${ELASTICSEARCH_HOST}:9200"]
index => "beat-logs"
}
}
if [type] == "snmp" {
elasticsearch {
hosts => ["${ELASTICSEARCH_HOST}:9200"]
index => "snmp-logs"
}
}
}
the logstash log is:
root#laundry:/opt/ground/management# docker logs -f -t -n=5 5ae67e146ab0
2023-02-03T02:35:04.639861138Z [2023-02-03T10:35:04,639][INFO ][logstash.inputs.beats ][main] Starting input listener {:address=>"0.0.0.0:5044"}
2023-02-03T02:35:04.873655686Z [2023-02-03T10:35:04,873][INFO ][logstash.javapipeline ][main] Pipeline started {"pipeline.id"=>"main"}
2023-02-03T02:35:04.885933029Z [2023-02-03T10:35:04,884][INFO ][logstash.inputs.tcp ][main][06f1d7ee5445cc0e11cda56012ef6767600f21acd6133e02e957f761d26bac84] Starting tcp input listener {:address=>"0.0.0.0:50000", :ssl_enable=>false}
2023-02-03T02:35:04.934224084Z [2023-02-03T10:35:04,933][INFO ][org.logstash.beats.Server][main][4b91981ecb09a5d2
the output of snmpwalk and snmpget:
root#laundry:/opt/ground/management# snmpwalk -v 2c -c laundry 192.168.131.125 1.3.6.1.2.1.1.1.0
iso.3.6.1.2.1.1.1.0 = STRING: "Linux laundry 5.15.0-58-generic #64-Ubuntu SMP Thu Jan 5 12:06:43 UTC 2023 aarch64"
root#laundry:/opt/ground/management# snmpget -v 2c -c laundry 192.168.131.125 1.3.6.1.2.1.1.1.0
iso.3.6.1.2.1.1.1.0 = STRING: "Linux laundry 5.15.0-58-generic #64-Ubuntu SMP Thu Jan 5 12:06:43 UTC 2023 aarch64"