@Georgios ********
From what I have been hearing, including from immigration officers, the amnesty isn't actually extending your visa in any way at all.
The amnesty only waves overstay fines. So technically if your stamp runs out you are on overstay.
And it is difficult to get anything done from an overstay situation. Try to avoid that.
PS This is not a fact and could change at any time, but it is how I understand it.