Hi,
I realized in my save, that the player Amar Dedic from RB Salzburg decided to play for the austrian national team instead of the bosnian. In reality he already decided to play for bosnia (he played from the beginning in the last nations league matches).
https://www.transfermarkt.co.uk/amar-dedic/nationalmannschaft/spieler/519184/verein_id/3446
So I guess this should not be an option anymore.
Kind regards.