I also faced this issue of Excessive battery drain while sleeping on MBP 2015,
This is what I did and resolved
Open Terminal
Type sudo pmset -b tcpkeepalive 0
Tried your tip last week but it didn't work for me. Every 1.5hrs as shown below, AOP.OutboxNotEmpty spu_queue_overflow still wakes the laptop. Will a reinstall of Sonoma fix this? If anyone has any other tips that you think will help, please let me know.
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