Hi, this issue is on a Xiaomi Mi 10T Lite.
The schedule power OFF works fine, but schedule power on only works sometimes, which means the alarm often fails to go off, because the phone doesn't always power on automatically.

Any ideas about a way to fix it? The Mi version is 12.0.1.0 Stable.

Is this a common software issue?
Thank you

 

It's a common feature on many smartphones, called Schedule Power on /off. In Xiaomi mi 10T Lite (and Mi Max 3), located in Settings / Battery and Performance,
But even without setting power off / on times, setting the alarm and turning the phone off manually, the alarm triggers the phone to turn on just before the alarm rings - that is, it's supposed to and works perfectly, for example in my Mi Max 3