This issue has been around for a few months now. if some app, YouTube is one, is open when you turn off the apple TV it will remain in a paused state and not change into standby.
There is an issue open, but no one seems to have looked at it or given any information.
The apple TV integration has some 20k installs, Iām really confused that one ones looking at this. or at least advising if there is anything that can be done for it
I have the same issue and i find it strange that this is not ironed out yet.
What i try to teach myself before i turn the apple tv of is to close all the apps.