For the protocol: today my Denon AVR 4311 wanted to upgrade its firmware so I let it do that. Indeed this was the first update I ever installed since the receiver was pretty mature as I bought it and in the meantime it's considered an "obsolete" product. So I was kinda surprised that there was an update and kinda hoped this could maybe fix the HDMI issues. Unfortunately it didn't. The behavior is still exactly as described above.
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