Jails under TrueNAS-13.0-U6.2 must currently NOT be updated to version 13.3! 13.3 introduces at least one new system call that is not supported by the older 13.2 kernel.
It is fatal that the program /usr/sbin/daemon makes use of this new system call and thus many services no longer start (e.g. also with vaultwarden and gitea).
Workaround
If an upgrade has already taken place, it helps to copy the /usr/sbin/daemon from the TrueNAS system to the jail. This is quite dirty, but helps for the moment: cp -p /usr/sbin/daemon /mnt/<pool>/iocage/jails/<jail>/root/usr/sbin/
Solution: Only with TrueNAS 13.3 the problem is fixed, then also a fresh kernel is included. Download ist available.
