As confirmed by some gaming users on telegram group, both speakers work on oos. I personally don't play gamesThere is one perticular issue with All Rom is when user plays pubg or cod or infact any game which has mic and speaker in use at the same time. Only bottom speaker works even with whatsapp calling on speaker phone only bottom speaker fires and we lose the stereo speakers. Is is fixable ?
On RUI or Color OS both speaker works in all scenario.