Unity Hub 2.2.1 headless - wrong exit code

Since the upgrade to Unity Hub 2.2.1 I've noticed that running headless commands doesn't always exit with 0 on a successful execution.

For example:

'"Unity Hub.exe" -- --headless install-path --set c:/Unity'

will print.

Code (csharp):

1.  
2. (node:5732) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
3. All Unity Editors will be installed to c:/Unity
4.  

And then exit with a non-zero exit code.
This is currently breaking our CI setup as it things the step has failed.