When installing or updating/validating a server with SteamCMD through the panel/daemon, it seems to always fail shortly after beginning the verification process, and exits with code 0. If SteamCMD is run from the operating system directly using the same files, it completes the actions successfully without error codes.
This is happening with the "default" mod for Counter-Strike: Source. I'm not sure if this happening with other games installed via SteamCMD, as I have not tested it.
I'm currently using Windows Server 2019 64-bit for the operating system. I don't know if other operating systems are also affected or not.