I think you guys are confused on his question.
What he's asking is if you hold on a talkgroup, does the scanner continue to scan the different trunked sites within the system.
I just checked on my 996XT, and the answer is , when you hold on a TG, it also holds on the trunked site.
So if onto H-PTL-2 within Zone 03, but drive out of the area of Zone 03, you'll no longer hear the site. At least that's how my 996XT is behaving.
I know the the HP series (436hp, 536hp both will continue to "scan" all the sites within your system when holding on a TG. If you want it to lock on the site, you need to use the site hold function)