A reoccurring theme here with THE FINALS from Embark Studios is that it appears to break on Linux / Steam Deck each major upgrade, and it has happened again with the launch of Update 5.12.0.
Read the full article here: https://www.gamingonlinux.com/2025/03/the-finals-broken-on-linux-steam-deck-yes-again-with-update-5-12-0/