Just installed latest LE 12 nightly (January 5 version), with Kodi v21 (Omega) Beta 2 - works well on my NUC 10, including pasthrough to HD audio.
I lost my preferred skin after this upgrade (AeonNox:Silvo) and skin repos were empty, but after re-installing skin from zip it recovered nicely, so I'm all good now 
Another thing I just noticed is that this version of LE is not switching off the NUC when power off signal is beamed, because Shutdown Menu is popping up and NUC stays with it forever (hard to notice on a blank TV screen 
).
This didn't help:
cp /usr/share/kodi/system/keymaps/keyboard.xml /storage/.kodi/userdata/keymaps/keyboard.xml
nano /storage/.kodi/userdata/keymaps/keyboard.xml
<power>ShutDown()</power>
<sleep>ShutDown()</sleep>This seems to solve it:
cp /usr/share/kodi/system/keymaps/remote.xml /storage/.kodi/userdata/keymaps/remote.xml
nano /storage/.kodi/userdata/keymaps/remote.xml
<power>ShutDown()</power>
