The workaround is confirm the "own" position in the STN DLNK page. If each team member change it or just confirm the ME position, the team visualization come back to live.
Other strange behaviours are about the GPS time, before using a non GPS sync, so just syncing client clocks TNDL worked fine (i think IRL there should be a NTR to master the time) now you can't see other F16 but you see the F18 members, strange no?
Other messed thing, staying on topic is the sharing on FCR. Before the numbers on top of a shared contact indicated correctly the number of the team member who bugged it. Now it's not anymore consistent.
falconzx's post in Multiplayer datalink share of detected air targets. was marked as the answer