Is it possible to power on a Kodi box with a CEC remote? Official remote might be broken, looking for other ways to boot up the box while not having to pull the power.Tronsmart S95.
Have you looked into WOL (wake on LAN)? Your box and router will need to support it... and you will need some know-how. I'm sure there will be separated threads for WOL. There are phone apps for WOL.
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I'm probably six months too late but have you considered changing settings of Marantz AVR to disable CEC? This is not ideal if you control the amp volume with your TV remote.
I understand this doesn't explain the difference in operation between OE and LE.