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F29 Unable to Switch Root when installing with PXE

I got the Fedora WS live DVD (from here), then set up dnsmasq to boot from network with PXE. I am currently seeing the syslinux bootloader.

My PXE server is not connected to a network, so I want to boot the PXE client using the DVD ISO, so I also set up a nginx server that serves the content of the ISO (mounted on loopback).

The kernel is booting with: vmlinuz initrd=initrd.img inst.stage2= inst.repo= (I found details on inst.repo here).

The problem is that, when booting, it fails with the message

Failed to start Switch Root

and journalctl says that

Failed to switch root: Specified switch root path '/sysroot/' does not seem to be an OS tree. os-release file is missing

What is this message and how do I fix it?