I don't have a Harmony so I don't know how it behaves or how it's programmed but I do know the POWER OFF command is messed up, both on H2 and H3. For H2, POWER OFF worked fine until some software update, then it started working as a power TOGGLE. On H3, POWER OFF does a power ON.
It's possible Harmony recognized this and did as I did and programed power off as: POWER ON, delay, POWER (toggle).
I also programmed the power on sequence as POWER ON, delay, CANCEL. This gets rid of the home screen at power up.