EnvoyFilter Patch request_timeout doesn't work

Hi there

I’m using istio 1.17
I deployed to limit request_timeout with istio EnvoyFilter

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: request-timeout
  namespace: istio-system # as defined in meshConfig resource.
spec:
  configPatches:
  - applyTo: NETWORK_FILTER # http connection manager is a filter in Envoy
    match:
      # context omitted so that this applies to both sidecars and gateways
      listener:
        filterChain:
          filter:
            name: "envoy.filters.network.http_connection_manager"
    patch:
      operation: MERGE
      value:
        name: "envoy.filters.network.http_connection_manager"
        typed_config:
          "@type": "type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager"
          common_http_protocol_options:
            idle_timeout: 3600s # 1 hour
#          http2_protocol_options:
#            max_concurrent_streams: 500
#            initial_stream_window_size: 65536 # 64 KiB
#            initial_connection_window_size: 1048576 # 1 MiB
          stream_idle_timeout: 300s # 5 mins, must be disabled for long-lived and streaming requests
          request_timeout: 1s # I set it to 1 second and tested it.

I’ve tested it with api that takes a long time (db data put, delete OR sleep) but request_timeout doesn’t occur
When I checked with stream_idle_timeout, timeout worked well.
(Because stream_idle_timeout worked, I understand that EnvoyFilter is well applied to my app)

Why is request_timeout not working?
Anyone knows why?