the steam-runtime libalsa will break, if it uses a git version of the alsa-lib configuration files.
I did notice it because I am the guy who fixed the configuration files (the changes are committed and will be there in the next version of alsa-lib)

The way to fix it is probably to avoid distributing the alsa-lib and reconsider it as a system dependency like the libGL/vulkan driver (dynamically loaded with used symbol resolving).