It seems the return code of systemctl daemon-reload can be !=0 in some
circumstances, which causes a failure of the unit and breaks booting in
the initrd.
[Service]
Type=oneshot
-ExecStartPre=@rootbindir@/systemctl daemon-reload
+ExecStartPre=-@rootbindir@/systemctl daemon-reload
# we have to retrigger initrd-fs.target after daemon-reload
ExecStart=-@rootbindir@/systemctl --no-block start initrd-fs.target
ExecStart=@rootbindir@/systemctl --no-block start initrd-cleanup.service