Fossilize_replay vulkan bug, arch proton

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Relevant cross post in the Arch forums: https://bbs.archlinux.org/viewtopic.php?pid=2138103#p2138103

I have been trying to get Vulkan to work, after it went kaput today and games stopped working. Latest drivers, proton versions, etc...all up to date.

Trying to run vulkaninfo, yields Segmentation fault (core dumped)

gdb reports statement(program exited with code 0377)

(gdb) bt produces No stack.

The problem from core dumps hashes traces back to fossilize.

core dumps look normal except for :

'core.rundll32\x2eexe.1000{longhash_function_here}.zst

Which seems to correspond to "core.fossilize_repla.1000" hash (Steam's shader layer), from core dumps.

Is this bug or a feature?