iMac Late 2013 Wake up Bug

I have installed Ventura on my late 2013 27 iMac. Everything works fine except when the iMac goes into sleep and I want to wake it up later. First I can’t get it to wake up with my Bluetooth apple mouse or keyboard. And when i press the power button I get a flickering black screen and can’t do anything. To work I have to restart it. Then it works again. Is this a known bug or how can I solve this?

submitted by /u/G4merbros_
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