Prison Architect 2 from Double Eleven and Paradox Interactive was recently revealed with an entirely new look, and while the original has full Native Linux support, the sequel will not.
They're not going to make a dedicated, supported native Linux build. They're saying you'll need to use proton, and that they'll look into making sure it runs properly on Proton.
Paradox is pure cancer. They killed the first PA because of incompetence and pure greed. Apparently they are not done killing the franchise in general.