That was one of the worst bugs in V5, I was asking and asking to fix it.
One of the worst things about NewsBin. I had spent many hours manually locating and redownloaded needed par2 files.
Now I see that the same bug is still in 6.01 beta 1.
I cannot find the needed par2 files. They are simply overwritten without renaming, exactly as in V5, it seems.
I have "Disable AutoPAR" checked - AutoPAR is disabled - so par2 files must be treated as ordinary files and must be auto-renamed.