Deep Harmony Extension: Power management problem

I have 2 activities on my Logitech Harmony:
Watch AppleTV
Both activities use the same DAC/streamer/preamp (the Matrix Element X). I want that device to stay on whenever I switch activities (and only turn off when I power down at the end of the day). I’ve gone into Harmony power settings to specify this. It works as intended when going from Roon to AppleTV (the Element X stays on) but not when going from AppleTV to Roon (the Element X powers off, despite my power setting).

I wonder if there is some feature I’m overlooking in Deep Harmony. Ideas?

Moved to Tinkering