@VectorStyler In my case, everything is currently working as it should.
Edit: I don't know why , but now, have the same issue as @Harry.  Just opened browser to write post here than returned to VS  and since that have to use shortcut twice.
Edit 2:  Ok, I know why it worked in my case.  AltGR + Letter works properly only for the first character in text field - any further require double use. I was typing 'Ą' , than delete and typing 'Ć' and so on.