I'm interested if this issue only occurs with AVR+TV. So connecting directly to the TV, (bypassing the AVR) is of interest.
I'm suspecting the issue won't occur but it would be interesting (and simpler to debug) if TV switches on when directly connected.
I have only TV connected to RPI4. I have attached logs in my previous post: RE: TV/AVR turns back on right after turning them off if cec logs can help...