Polygon Rotation

I saw something strange when copying a Free Polygon. I don't know if it is made on purpose or if it is a bug. It may also happen the same thing also for other components or settings, I did not check other cases.

If I have a Free Polygon with any rotation value, for example 30 degree. I copy it. Then I paste the copy and I obtain a new Free Polygon with rotation 30 degree. And this is as it should be.

Then, this is the strange thing. I have that same Free Polygon with the 30 degree rotation value. I connect to the rotation plug an Angle Control with any value, 90 degree for example. I copy the set Free Polygon + Angle Control.
What should I obtain when I paste it?
The obvious answer is a Free Polygon with a 30 degree rotation value connected to an Angle Control with 90 degree value.
Instead no.
I get the Angle Control with the correct 90 degree value, but the Free Polygon loses its 30 degree value.
Is it simply a setting made on purpose for reducing the things that FF must store?
Is it something that was forgotten?
Is it a bug?