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Borked alarm rule
(sh.itjust.works)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
I've got something interesting too.
No alarm rang. I picked up the phone, no notifications. I opened the clocked app and suddenly got "missed alarm" notifications.
No shit Sherlock.
Oddly my alarm also failed to go off this morning but presented a missed alarm notification, but I'm using a Samsung. Surely it's coincidence.
Did you have to manually unlock your phone instead of fingerprint or whatever?
Nope.
I even disabled battery saving for clock app, locked it in recents, disabled cache clearing when device is locked.
This only happened to me twice after these precautions, but, MIUI. It's quite buggy, so I don't know if it's power saving or just buginess.