The image and the installed system may have kernels with different KFLAVOUR.

There is wrong  to configure the tty in the initrd, as this prevents
the tty from being configured according to the specified language in
the kernel cmdline.

Needed make-initrd-bootchain >= 0.1.5-alt18

Now adding configs makes itself make-initrd-bootchain.

If udev-rule-generator-net is installed on the system, add the interface
naming rules from this package to the initrd. If not, add the standard
udev rules.

The naming conventions for network interfaces on stage1 and stage2 must match.
See also: https://lists.altlinux.org/pipermail/make-initrd/2021-September/000568.html

This is an alternative to the initrd-propagator feature.
bootchain-* is a make-initrd features. You should look at the documentation
for it in the make-initrd-bootchain-* packages:
/usr/share/make-initrd/features/bootchain-*/README.md