Sri,
It would help if the your output matched the playbook you are running.
Your problem task isn't even in your test playbook!
 

> TASK: [debug msg="{{ 
> echo_output.results|map(attribute='stdout_lines')|list}}"] ***
> ok: [127.0.0.1] => {
>     "msg": "[Undefined, Undefined]"
> }
>

Anyway, this works for me on stable-2.0.0.1 on centos 7.
I get the output below, which is probably what you are expecting:

ok: [t1] => {
    "msg": [
        [
            "hi"
        ], 
        [
            "hello"
        ]
    ]
}

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