Documentation [0] is not showing how to use Butane for setting a well-known-password for accessing RHOCP nodes using `core` user.
We have a KCS for that at [1] - which implies using unencrypted values - but no proper example for Butane.
Now, upstream CoreOS doc [2] shows how to deal with this, but given the lack of `yescrypt` method in RHEL9 [3] (and RHEL8 as well) we should provide something else.

[0] https://docs.openshift.com/container-platform/4.13/installing/install_config/installing-customizing.html
[1] https://access.redhat.com/solutions/7010657
[2] https://coreos.github.io/butane/examples/#using-password-authentication
[3] https://bugzilla.redhat.com/show_bug.cgi?id=1980462 

4.x

This is a documentation bug, there is no mention in doc

1. Have a look at doc https://docs.openshift.com/container-platform/4.13/installing/install_config/installing-customizing.html
2. Compare with https://access.redhat.com/solutions/7010657

No examples given with Butane tool

Proper example given using Butane (possibly with sha-512 salt)