SOLUTION:
PublicLibraryPaths is outdated. Make sure to use PublicIncludePaths.
Additional info (directly from the compiler): Library ‘YOURFILE.lib’ was not resolvable to a file when used in Module ‘YOURFILE’, assuming it is a filename and will search library paths for it. This is slow and dependency checking will not work for it. Please update reference to be fully qualified alternatively use PublicSystemLibraryPaths if you do intended to use this slow path to suppress this warning.
Resources: