ActivateWindow home not working in Guide

I just setup a new ShieldTV with Kodi 17 and TItan. I duplicated my remote setup from my htpc which includes a button for ActivateWindow(Home). Which nicely works to get back to the Kodi homescreen from anywhere.

However, on the new setup it works everywhere except in the PVR Guide screen. Any ideas why it wouldn’t work from that screen?

Running latest stable release of Titan from the Kodi repository.