I'm having this issue as well, if you talk at all with the microphone set to open Deadlock will crash along with the Steam client, changing Proton versions doesn't seem to help, and reinstalling Steam doesn't appear to work either. I even tried the native runtime version of Steam but that didn't fix the issue either.
Hardware Information - Ryzen 5 3600, RX 6600 XT, 16GB DDR4 3600MHz, Arch Linux (Kernel 6.10.5-arch1-1), Plasma 6.1.4, Wayland