Thanks for the replies; however, other information has come to light which means I shan’t be upgrading at all!
I’ll continue with the current release and I shall take steps to try to make sure I remain secure.
edit, August 2026: I took the Nvidia P620 graphics card out and stuck it in a different machine. I am now running Frigate in that other machine as a pure docker instance, alleviating the burden on my elderly TrueNAS box which is slowly losing apps to Docker and becoming a pure NAS once again. This enabled me to upgrade to the latest TN without concern, an easy process which took me ten minutes this morning.