I just tested this calling from my work phone using the same method, multiple times - received a missed call notification, opened notification, call log in phone showed missed call. The first time I looked for a notification almost instantly, the second time I waited 15-20 seconds before looking for it, then third time I had the device unlocked and "on" (screen on, not playing dead), and the fourth time I only let it ring for about 2 seconds. No issues at all. I'm on PR1.2 with a clean flash + eMMC, not an OTA upgrade.