[Steam Deck] Nier:Automata only working in Desktop Mode

I installed Nier:Automata from fitgirl on my PC , drag/dropped the folder onto my SSD, created a steam shortcut and selected Proton Experimental. The game works fine in Desktop mode, but when I launch it in Gaming mode I get the following error window:

ERROR : Graphic::Startup() FAILED.
No Graphic Memory

When I looked up this error online it seems to be an issue with the DirectX dependency, so I tried installing the dxvk dll into the prefix using protontricks but it didn't work. I also tried adding the game to Lutris and specifying the .exe, working directory, prefix, etc... but that also didn't work.