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I did some investigation and managed to found this Fedora change proposal [1].

The support to use `inst.` prefix for all anaconda options was introduced back in 2012 in 17.7 version
and now in version 34.24 they started ignoring options without `inst.` prefix.

To put the versions into context:

  - RHEL-6 and older, Fedora 16 and older are using anaconda older then 17.7 so no support for `inst.` prefix

  - RHEL-7, RHEL-8, Fedora-17 to Fedora-33 have support for `inst.` prefix but it's optional

  - RHEL-9, Fedora-34 and newer have anaconda 34.24 or newer so they support only options with `inst.` prefix


In virt-install we can only update man page to use inst.ks in the examples but otherwise there is nothing else to do as the option is provided by users. This will probably need documentation changes as well.

But the solution is to simply use inst.ks instead of ks option.


[1] <https://fedoraproject.org/wiki/Changes/Ignore_Anaconda_kernel_boot_parameters_without_inst_prefix>