Oh well. Intel could at least point us which AVR it used for testing (if any). At the very least it would serve as a starting point for us to begin bothering Denon/Marantz about it.
I went to an AMD box from an Intel box and problem solved. It wasn't my preferred approach but I got tired of waiting. The Intel boxes I have (NUC 8i7BEH and N100) both work fine with my Yamaha AVR as long as I don't use passthrough audio.
Jeff