Don’t forget me 
Mine added to HomeKit and stayed connected to it, flawlessly, for the month I had them connected. (I’ve since removed all accessories from HomeKit, deleted the Home instance, and moved the iPhone/iPad app off to a corner. Even had I kept using HomeKit, I didn’t find the Rachio 3 being added particularly useful.)
In all this noise, what some of y’all have failed to notice is that, for something y’all seem to think is so common, it appears to have taken Apple’s people three weeks to replicate. (Based on the date at which Rachio announced Apple’s people were looking into it and the date it was announced they’d finally managed to replicate the problem.) IOW: Apple’s people had to work at it to get it to fail.