Got the same/similar issue. Using Stable though 9.1.0 (not yet 9.2.0).
I don’t suspend my N2 (cause sometimes it didn’t want to boot and I don’t care about the power consumption when idle) but when I switch to the HDMI port it’s on it sometimes wakes up, sometimes doesn’t.
When I go for example from my youtube app (not even a HDMI source) or my set top box (other HDMI port) to my N2 the N2 doesnt always wake up and my commands from my remote (through CEC) keeps going to the last source. (had some funny stuff going on on my settopbox which I didn’t see because of it ;-))
Most of the time when I go back to the other source (app or hdmi) and indeed wait a few seconds before going to my N2 it wakes up.
A few rare times I’ve had to enable/disable CEC on my tv for it to work.
Looks more like an issue with the CEC Driver…