OK, so here's something I went through that may or may not assist with troubleshooting (I'm using MSFS 2020 store version by the way).
I uninstalled GSX completely, reinstalled using the manual file link from FSDT site, and post-install everything looked fine. I loaded a flight and when I clicked to activate GSX in the MSFS toolbar, it didn't exist at all (no menu or toolbar inside MSFS, as if GSX wasn't even installed).
I existed MSFS, loaded up the FSDT installer and GSX looked fine, so I clicked on
Check to reinstall/repair files. After it ran all through it's normal process, I reloaded the flight in MSFS. Lo, and behold, I see all the trucks are back and the pinkies seem to be gone.
So, definitely some kind of install issue we're all seeing and I can suggest that if you don't find resolution the first time, some combination of uninstall/reinstall/check may do the trick! Glad to be back in the saddle

.
EDIT: There are still a
few passengers and passengers' devices that are pink but a small segment - most are fine. So, there may be some additional loading that needs to happen. I just hate to keep doing it again if it's going to unfix what I've already fixed which is the vast majority of objects.