Ruby 3.3.0 not pre-installed using RVM

Ruby 3.3.0 isn’t available by default, and I need to enforce the installation at before_install section. Which takes up to 17 seconds.

Shouldn’t it be pre-installed ?

If yes, It will mean I have an issue with my config, that I will need to investigate.
If no, what’s the rules about pre-install version, and when would ruby 3.3.0 will come as pre-installed ?