I think I have an idea what the plant is. I dont know what its called, but it has lovely leaves and the stem has prickers on it.
Once in a while I find some in my daylily garden, so next time I find some, I will use the leaf ID app on it.
Its very short and is more of a vine.
I will go out tomorrow and see if I can find some, its not very common. And in the fall it turns a bit lighter and reddish.
Hopefully its a similar plant.