Prefetch Custom Textures crashes client on Linux

[itsonlyMiRE]

Expected Behavior

With Prefetch Custom Textures graphics option enabled, the .iso should open and prefetch custom textures reliably without crashing.

Current Behavior

On occasion when launching an .iso with custom textures and prefetch enabled, the client crashes. When done in a terminal, the error message reads:

AppRun.wrapped: stb_image_aug.c:1750: zhuffman_decode: Assertion `z->size[b] == s' failed.
Aborted (core dumped)

This error stems from a check in Externals/SOIL/stb_image_aug.c.

Steps to Reproduce

1. Run ./Slippi_Online-x86_64.AppImage -e "Super Smash Bros. Melee.iso", or run the AppImage and open .iso from list
2. Observe for crash

Other info

Bug occurs in Linux (Ubuntu 21.04) with Ishiiruka 2.3.2 Slippi client, I don't recall ever running into crashing on Windows. The weird thing is this only happens intermittently (though I would say more often than not). I'm not sure why this would only happen some of the time and not consistently if all the textures are being fetched on startup. I would understand if you are not interested in resolving bugs pertaining to custom textures, but I think it is significant enough to report.