Memcached protocol doesn't work

Hi, we implemented memcached protocol in aeraki and used DeathStarBenchmark/hotel-reservation to test.

Meta-protocol-proxy implementation: https://github.com/yizhengx/meta-protocol-proxy/tree/local-queue/src/application_protocols/memcached

We built it using bazel following the instructions in the document.

Example yamls for memcached services
- deployment
```
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.22.0 (955b78124)
creationTimestamp: null
labels:
io.kompose.service: memcached-rate
name: memcached-rate
spec:
replicas: 1
selector:
matchLabels:
io.kompose.service: memcached-rate
strategy: {}
template:
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.22.0 (955b78124)
sidecar.istio.io/statsInclusionPrefixes: cluster.outbound,cluster_manager,listener_manager,http_mixer_filter,tcp_mixer_filter,server,cluster.xds-grp,listener,connection_manager
sidecar.istio.io/statsInclusionRegexps: http.*
sidecar.istio.io/bootstrapOverride: aeraki-bootstrap-config
sidecar.istio.io/proxyImage: yizhengx/aeraki-proxy:rate-limit-cas # custom image we built
creationTimestamp: null
labels:
io.kompose.service: memcached-rate
spec:
containers:
- env:
- name: MEMCACHED_CACHE_SIZE
value: "128"
- name: MEMCACHED_THREADS
value: "2"
image: memcached
name: hotel-reserv-rate-mmc
ports:
- containerPort: 11211
resources:
requests:
cpu: 100m
limits:
cpu: 1000m
restartPolicy: Always
status: {}
```
- service
```
apiVersion: v1
kind: Service
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.22.0 (955b78124)
creationTimestamp: null
labels:
io.kompose.service: memcached-rate
name: memcached-rate
spec:
ports:
- name: tcp-metaprotocol-memcached-memcached-rate
protocol: TCP
port: 11211
targetPort: 11211
selector:
io.kompose.service: memcached-rate
status:
loadBalancer: {}
```

I really appreciate any advice on this including what we missed and how we can find the root cause. Thanks!