Trading Resources with the AI tip

[JBossch]

I think it is. Why should the AI get turns during my turn? They should not be immediately affected. They should have the right to say no to the deal of course but the money should be unchanged until it's their turn.
They certainly shouldn't be able to change their slider.

I agree. This is total BS. Ormur is right about the gold often being available soon after but I still think its an open question why this happens.
If vale's answer is correct, I consider it a bug.