I have a TrueNAS Core 13 machine and installed Alma Linux 9.2 as a host for XenOrchestra from source. the VNC console works for a short period of time but then eventually I am unable to reconnect to it. I have to power cycle the VM to restore VNC Console access and sometimes have to power cycle to gain access to the VM via SSH or XO from the web.
I never really used virtualization in TrueNAS Core 13 because I found it very buggy, that’s also why I did not ever do a video on it.
I have since moved my XOS to a VM on XCP-NG. I will continue to test it on TrueNAS but will just just my other instance as my primary choice.