Fedora 30 - "Failed to initialize Vulkan. Please make sure your driver and GPU support Vulkan." when game is started about dota-underlords

[Yetoo1]

This is still occurring on Fedora 31.
Updated system information: http://web.archive.org/web/20200121154727/https://pastebin.com/BdrqGaPg

[Yetoo1]

This still occurs on Fedora 33, but, if I use the Steam Linux Runtime, this error doesn't occur and I am able to play the game.
Updated system information: https://web.archive.org/web/20210604005107/https://pastebin.com/YWX7YjMe

Running ./underlords.sh yields:

FATAL: /mnt/bigboy/SteamLibrary_Linux/steamapps/common/Underlords/game/bin/linuxsteamrt64/libengine2.so not loaded
	dlerror(): /valve/steam-runtime/bin/../runtime/amd64/usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.19' not found (required by /mnt/bigboy/SteamLibrary_Linux/steamapps/common/Underlords/game/bin/linuxsteamrt64/libengine2.so)

Running STEAM_RUNTIME=0 ./underlords.sh failed with the following relevant error in output:
failed to dlopen "libpangoft2-1.0.so" error=libbz2.so.1.0: cannot open shared object file: No such file or directory

I made a symbolic link to libbz2.so.1.0 via sudo ln -s /lib64/libbz2.so.1 /lib64/libbz2.so.1.0 and now I am able to run STEAM_RUNTIME=0 ./underlords.sh or STEAM_RUNTIME=1 ./underlords.sh (still not able to run bare ./underlords.sh) with no errors preventing it from starting. But when I try to play the game via the Steam interface, I still get the Failed to initialize Vulkan. Please make sure your driver and GPU support Vulkan. error. I get that error with both STEAM_RUNTIME_PREFER_HOST_LIBRARIES=0 steam or STEAM_RUNTIME_PREFER_HOST_LIBRARIES=1 steam as well as running the two aforementioned commands with -vulkan_disable_steam_shader_cache appended to them and appended to just steam`.