Slurmd crashes when emulating a larger cluster in versions 21 and 22 - slurm

Question

I have been maintaining a Slurm simulator for ages. I have everything automated in other to try new features and keep my configuration up to date, version after version.
Unfortunately, from version 21, the front-end mode makes the slurmd daemon crash with the following error message:
slurmd: error: _find_node_record: lookup failure for node "slurm-simulator"
slurmd: error: _find_node_record: lookup failure for node "slurm-simulator", alias "slurm-simulator"
slurmd: error: slurmd initialization failed
The exact same container, with the same configuration but using version 20.11.9, works just fine. I reproduced the same steps manually in a VM to remove the noise introduced by the container, but the result is the same.
The attached configuration is available in the container.
[root#slurm-simulator /]# cat /etc/slurm/slurm.conf
ClusterName=simulator
SlurmctldHost=slurm-simulator
FrontendName=slurm-simulator
MpiDefault=none
ProctrackType=proctrack/linuxproc
ReturnToService=1
SlurmctldPidFile=/var/run/slurmctld.pid
SlurmctldPort=6817
SlurmdPidFile=/var/run/slurmd.pid
SlurmdPort=6818
SlurmdSpoolDir=/var/spool/slurmd
SlurmUser=root
StateSaveLocation=/var/spool/slurmctld
SwitchType=switch/none
TaskPlugin=task/none
InactiveLimit=0
KillWait=30
MinJobAge=300
SlurmctldTimeout=120
SlurmdTimeout=300
Waittime=0
SchedulerType=sched/backfill
SelectType=select/cons_tres
SelectTypeParameters=CR_Core
AccountingStorageType=accounting_storage/slurmdbd
JobCompType=jobcomp/none
JobAcctGatherFrequency=30
JobAcctGatherType=jobacct_gather/none
SlurmctldDebug=info
SlurmctldLogFile=/var/log/slurmctld.log
SlurmdDebug=info
SlurmdLogFile=/var/log/slurmd.log
SlurmdParameters=config_overrides
include /etc/slurm/nodes.conf
include /etc/slurm/partitions.conf
[root#slurm-simulator /]# cat /etc/slurm/nodes.conf
NodeName=node[001-10] RealMemory=248000 Sockets=2 CoresPerSocket=32 ThreadsPerCore=1 State=UNKNOWN NodeAddr=slurm-simulator NodeHostName=slurm-simulator
[root#slurm-simulator /]# cat /etc/slurm/partitions.conf
PartitionName=long Nodes=node[001-10] Default=YES State=UP OverSubscribe=NO MaxTime=14-00:00:00
The error can be reproduced by running the following commands:
docker run --rm --detach \
--name "${USER}_simulator" \
-h "slurm-simulator" \
--security-opt seccomp:unconfined \
--privileged -e container=docker \
-v /run -v /sys/fs/cgroup:/sys/fs/cgroup \
--cgroupns=host \
hpcnow/slurm_simulator:21.08.8-2 /usr/sbin/init
docker exec -ti ${USER}_simulator /bin/bash
slurmd -D -vvvvv
If you try the same command with v20.11.9 it will work. I have tried using the new SlurmdParameters=config_overrides option, but I still get the same problem.
Any ideas or suggestions?
Thanks!