Greetings!
I have the same issue like in the topic “Java reporting wrong time zone in Jail” in the old TrueNAS Community .
I’m just not allowed to link to it.
The only difference: I see wrong time (zone) in ioBroker after restart of TrueNAS (separate jail).
Timezone in BIOS is correct, also timezone under “System > General > Timezone”.
But for correct time in ioBroker I have to run tzsetup manually after every reboot - and I have to restart ioBroker host additionally.
(You may wonder why I reboot the PC - it’s not voluntarily, this is an other topic 
).
So this issue still doesn’t seem to be fixed.
Is there anything else I can do?
I sometimes don’t have access to my TrueNAS-System in case of a reboot, and wrong time in ioBroker has some uncomfortable consequences…