Maybe you find some hints here: www.protondb.com/app/22300?device=steamDeck (Fallout 3 user reports for Steam Deck) or www.protondb.com/app/22370?device=steamDeck (Fallout 3 Game of the Year Edition user reports for Steam Deck)
Maybe you find some hints here: www.protondb.com/app/22300?device=steamDeck (Fallout 3 user reports for Steam Deck) or www.protondb.com/app/22370?device=steamDeck (Fallout 3 Game of the Year Edition user reports for Steam Deck)