Seems most are running Channels dvr (rather than channels for hdhomerun) here so the multiple topics I skimmed over may not be relevant?
I installed Channels for hdhomerun on android tv. Initially the guide was full, but after a day the guide is completely empty for all channels. I can't see any settings where the guide is configurable in this app or ways to trigger a guide refresh.i have submitted this in the app itself.
This is on a 4k chromecast with Google tv with latest updates.