Yes, you are right. FAI is not yet using systemd, so it needs
network-legacy. A change in the dependencies of dracut 059 now needs a
simple patch for fai-make-nfsroot to make sure dracut-network gets installed.
This is the change
https://github.com/faiproject/fai/commit/9e640bea6848bedc24fcdec32ce19d2605565d32

which is already included in FAI 6.0. I recommend to use FAI 6.0 also
on a bullseye FAI server, to create an bookworm nfsroot.

-- 
best regards Thomas

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