Wildfly 13 ejb stateless session bean not removed from pool

Question

When load increases then stateless session beans count increases but later stateless beans are not removed from slsb-strict-max-pool when all are idle. Is there any setting to remove idle stateless bean ? Same issue in wildly 21 also. See below, pool-remove-count is always 0.

standalone.xml

..........
        <subsystem xmlns="urn:jboss:domain:ejb3:5.0">
            <session-bean>
                <stateless>
                    <bean-instance-pool-ref pool-name="slsb-strict-max-pool"/>
                </stateless>
                <stateful default-access-timeout="60000" cache-ref="distributable" passivation-disabled-cache-ref="simple"/>
                <singleton default-access-timeout="5000"/>
            </session-bean>
            <mdb>
                <resource-adapter-ref resource-adapter-name="${ejb.resource-adapter-name:activemq-ra.rar}"/>
                <bean-instance-pool-ref pool-name="mdb-strict-max-pool"/>
            </mdb>
            <pools>
                <bean-instance-pools>
                    <strict-max-pool name="slsb-strict-max-pool" max-pool-size="150" instance-acquisition-timeout="2" instance-acquisition-timeout-unit="MINUTES"/>
                    <strict-max-pool name="mdb-strict-max-pool" max-pool-size="100" instance-acquisition-timeout="2" instance-acquisition-timeout-unit="MINUTES"/>
                </bean-instance-pools>
            </pools>
...................

sudo /opt/wildfly-13.0.0.Final/bin/jboss-cli.sh -c command="/deployment=Test-EAR.ear/subdeployment=Test.jar/subsystem=ejb3/stateless-session-bean=TestBean:read-resource(include-runtime=true)"
{
    "outcome" => "success",
    "result" => {
        "component-class-name" => "TestBean",
        "declared-roles" => [],
        "execution-time" => 237948636L,
        "invocations" => 67748L,
        "methods" => {"performRequest" => {
            "execution-time" => 237948636L,
            "invocations" => 67748L,
            "wait-time" => 4403L
        }},
        "peak-concurrent-invocations" => 150L,
        "pool-available-count" => 150,
        "pool-create-count" => 150,
        "pool-current-size" => 150,
        "pool-max-size" => 150,
        "pool-name" => "slsb-strict-max-pool",
        "pool-remove-count" => 0,
        "run-as-role" => undefined,
        "security-domain" => "other",
        "timers" => [],
        "wait-time" => 4403L,
        "service" => undefined
    }
}

Please help. Thanks.