System info:

• Distro: CachyOS
• Kernel: 7.1.5-1-cachyos-bore
• GPU: NVIDIA GTX 1050 Ti Mobile
• Driver: 580 series
• Proton version tested: GE-Proton10-34 (also tried Proton Experimental, Proton Hotfix - same result)
• Filesystem: btrfs (also tested on NTFS with identical result, so filesystem is not the cause)

Steps I've already tried (all failed to fix it):

• Deleted mod data / verified game files via Steam
• Deleted and recreated the Proton prefix from scratch
• Moved the game from an NTFS library to a fresh btrfs partition, clean install, same crash
• Tested with both -dx11 and default DX12, same crash either way
• Tested with Launch Options set to just %command% (no extra flags)
• Confirmed no leftover .pak mod files in ReadyOrNot/Content/Paks
• Confirmed GPU driver matches kernel (580 series, no mismatch)

What happens:
Game launches, runs for about 8-9 seconds, then crashes. Process exits with code 3. The game's own crash reporter dialog appears ("Ready Or Not has encountered a critical error and could not recover"), but its resources.dll fails to load so it can't actually submit a report (FileNotFoundException for CrashReporter.resources.dll).

Relevant Proton log excerpt:
The crash is a repeating Access Violation (Exception 0xc0000005), happening ~24 times within under a second right before the game exits:

7257.387:0140:0148:warn:seh:dispatch_exception backtrace: --- Exception 0xc0000005.
7257.387:0140:0148:warn:seh:virtual_unwind backtrace: ntdll.dll + 00000000000389AC.
7257.387:0140:0148:warn:seh:virtual_unwind backtrace: ntdll.dll + 00000000000386C6.
7257.387:0140:0148:warn:seh:virtual_unwind backtrace: ReadyOrNotSteam-Win64-Shipping.exe + 0000000000C0D471.

This exact pattern (same offset, same exception) reproduces identically across different Proton versions, different filesystems, and a completely clean prefix.

Full Proton log attached below.

steam-1144200.txt