Rachio 3 responding in Home app, but no Zones

My Rachio 3 appears in the Home app just fine. I am not dealing with any “not responding” issues. This is what that looks like:

When I tap on that square I see this:

When everything is working properly, I would see eight sliders there, one for each of my sprinkler zones. The screen remains blank.

What would be the cause of that?

Every so often, I get the zones to show up. It is highly intermittent, however, and rare.

I know this is Home app functionality, and the Rachio is responding.

This could be a problem with the Home app—I did not see this with whatever iOS version I was using last summer—or a problem with how the Rachio responded to the Home app to requested information.