On initial install, I was getting getting a Wine C++ Runtime Library error with an assertion failed when launching the game, no matter what launch options I tried or what proton version I used. In the end, I found a post on the archlinux forum that suggested removing the 'lib32-amdvlk' and 'amdvlk' packages, and replacing them with the 'lib32-vulkan-radeon' and 'vulkan-radeon' packages. Doing this was the immediate solution to the problem.