I did a clean installation of Ubuntu 22.04 LTS. After update and upgrade, first thing I did was download and ./Install UPP version 16450.

After that, Assist++ is up and running, parsing the sources and populating the right panel with class/function/etc info. I was even successful to invoke code completion with object name following by a dot(.). It went much further than it used to. Unfortunately segmentation fault follows. Yes, it's built in debug mode. No, gdb, run & bt would not produce anything useful, essentially very similar to what Tom and I have posted.