Since the Android 12 update, the battery life is miserable. 100% charged, with or energy-saving mode overnight, battery in the morning at 17%!!!
Is this a known problem?
Before the update, the battery lost approx. 10% overnight...

Question

Since the Android 12 update, the battery life is miserable. 100% charged, with or energy-saving mode overnight, battery in the morning at 17%!!!
Is this a known problem? 
Before the update, the battery lost approx. 10% overnight...

Accepted Answer

The problem is known. XDA writes that you should reset the phone to factory settings, which will solve the problems:
https://www.xda-developers.com/factory-reset-oneplus-9-series-improve-experience-oxygenos-12

Answer

I have now reset the phone. The battery now "only" discharges to 30% at night.
I hope that Oneplus will solve this problem. 
I wonder if this is under warranty, I definitely don't need such a phone.

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Question about OnePlus 9 (8GB)

Since the Android 12 update, the battery life is miserable. 100% charged, with or energy-saving mode overnight, battery in the morning at 17%!!! Is this a known problem? Before the update, the battery lost approx. 10% overnight...