FYI I went back to 11th gen, and if you suspend and then plug in the charger, the system will wake.
Similarly on windows, if you suspend and then close the lid, the system will wake up to process the event and then go back to sleep again.
This is expected behavior because we have to send a SCI event to the APU to notify the OS that the system is now on AC. This needs to wake the OS so the OS sleep policy can change from AC->DC.
For example if you start sleeping on DC, the system will hibernate after some time on windows, but after you plug in AC, the system can stay in modern standby indefinitely.
On windows the OS will wake up to process the event, and then go back to sleep after a few seconds.