You're right-- it wasn't a software update. It was just a push update. I received an email from my Ecobee stating this update occurred, and the display on my unit also said the same facts. You can read more about it here:
https://www.ecobee.com/faq/how-do-i...my-homekit-enabled-ecobee3-when-in-auto-mode/
As for the issue you were talking about (must have missed that in this thread)-- i've never had such an issue. my Ecobee3 is set that any changes to temperature would hold until the next scheduled event. So if I used Siri to change the temp, it properly holds until the next scheduled change. Equally so, telling Ecobee to go home/away works the same, too. I've never experienced any other issues though perhaps I'm not understanding precisely the issue you speak of, sorry.
Dude, you and I went back and forth about this issue in this thread months ago, you don't remember? The issue is if you use any scene to change the temp, as in I'm leaving or I'm home, the schedule you set in ecobee won't resume unless you give another Siri command. Everything you and I went back and forth is in the above thread.