Calls in speaker mode only are for listening, no for speaking (One way mode)

Calls in speaker mode only are for listening, no for speaking (One way conversation in hands free mode).

Launcher: Pixel Launcher
Version: MK71.2-le_x2-2017011241323-NIGHTLY

Steps:

1.- Unlock the phone
2.- In the desktop, press the dialer app, (Google Dialer v14.0.175904292 in my case)
3.- Make a call
4.- Whith the call in progress, press the “Speaker” button to enter in hands free mode.
5.- Bug: You will ear the conversation, but your listener can not ear you.

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