System.setClipboard not 100% correct

I’m using System.setClipboard to add content to the clipboard but I have come across something quite strange which I hope someone could help me solve. Part of the code uses this script:

on (press){
   System.setClipboard("Ą");
}

But when pasted , that particular character does not show and instead a standard ‘A’ appears.

Can someone help solve this please?

Y