How do I install beta command line tools using softwareupdate -l on 10.14.5? On a clean install of 10.14.5: Multiple reports of the beta version not working using a headless install: https://github.com/Homebrew/install/issues/206

This lead me to trying to manually do a headless install. I tried all of the various methods in How can I install the Command Line Tools completely from the command line? and none of them show anything but:

Mac-mini:~ anka$ /usr/sbin/softwareupdate -l | grep "\*"
 * MacBook Pro Supplemental Update-


Yet, I can xcode-select --install and it allows me to install it.

Anyone know how to get it to show up in softwareupdate -l so we can headless install it?
Apple looks to have fixed it. I had submitted a bug report, but I'm not sure if that helped or not.