I provide a little more information about it. The problem occurs when you have a shared house on Google Home. As you already know, now Home Assistant tells you who has turned off a light. So I have tried to achieve this with Google Home, but without fully success.
First of all, I have added my Action test in my Google Home account, getting all “my” Home Assistant entitties in our Google Home. Both my wife and I can see and use them because we are members of the same Google Home house.
What is the problem here? Regardless of who turns them on, Home Assistant will always tell us that I was the one who turned it on. So, I tried to solve it using allowing other users.
But when I add my wife Action test (which is actually a copy of mine, as the documentation indicates) to her Google Home account, we got all the duplicate Home Assistant entities, both for her and for me.
I have observed that if I turn on the first duplicate light, Home Assistant indicates that I have turned it on, and if I turn on the second duplicate light, Home Assistant indicates that it was my wife who turned it on. So it’s working fine.
The problem occurs when both use the same Google Home house, that is, my wife and I are members of the same Google Home house. This way, if I add a device, she will see it, and vice versa. That is why the duplication of entities occurs.
I don’t think the solution is to use different Google Home houses. I do not know if there will be a solution to this problem and I do not know it. But of course, the ideal would be a single house with several members in which the trace of who did what in Home Assistant would be saved, without obtaining duplicate entities in Google Home.