I checked the edid in my /flash partition, and compared to the one on my HDMI device it is identical. I also used read-edid and it looks like it should be correct (I see references to my Denon AVR).
So, my current theory is that when I unsuspend my LE HTPC, it turns on libCEC which then send the wake command to my AVR and TV. So when libCEC is initialized, those components are not on, and libCEC does not respect the edid from 'getedid create'. It sees that nothing is currently connected and changes the 'Connected to HDMI device' and 'Physical address' settings to the default values.
At somepoint I'll test out LE13 and see if that also resets the libCEC settings.