The FCR does have a datalink info layer possibility last I checked. On the CTRL page you should be able to turn that layer on and odd (similar with the HSD CTRL options). By default all of the display options are set to on.
Seeing DL symbols on the HSD but not on the corresponding FCR CRM positions is very unusual. I’m curious what DTC was used, what exact model and block F-16 was it, any mods, etc.
Well mostly flying Block 52 ATM, I’m going to investigate this fully later today when I find the time.