Its a bug and it was brought up quite a while back with @gopher.ny , but to my knowledge it was never fixed. I will see if I can find the old thread.
If you are using Zooz dimmers, I made a workaround patch in my driver that should prevent the issue by blocking the extra 'on' command that is being sent:
[DRIVER] Zooz ZEN Switches Advanced (and Dimmers)
EDIT: Looks like @pexer95039 beat me to it and found the old thread, adding link to my post over there which demonstrates the issue:
Apple home integration overrides power off/on behavior - #26 by jtp10181
