Ambient Display. A very nice feature.After a missed call, when i picked up my phone, the display was automatically enabled, without touching anything. Before that, with CM 13, 12, or factory android, i had to press the power button to see my notifications. I thought that this is a nice feature, but then i looked at the battery charge % and it was very low, without reason. So i've opened the battery menu in the settings, and saw that the phone was awake roughly since the missed call, till i looked at the notification.
So i've called my phone from another one, waited, and looked the battery history again, and the same happened, that missed call notification keeps the phone awake.
Is this a bug or feature? If a feature, then how can i disable it?