C2ISTAR only generates one task at a time. when a player join on a squad that hadn't a player before, if there's already a running task, no further tasks are created and the late joiner get no direction on what to do.

is there a way to have the existing task enabled for late joiners?

it also appears that users don't receive intel marker if joining after game start

test mission: https://we.tl/t-qq29DCtwuA

test server: 192.210.255.125 ( Alive + RHS USAF, & RHS AFRF )

you also don't get a "talk to the pilot" option on the second transport heli, but you can still order it around with the tablet (server use ItemGSP)

it also looks like server is not reinforcing blufor side, despite having a military logistic connected set to dynamic/infinite

check if both slots are from same faction, use always vanilla units BLU_F, i tried with rhs units and tasks will not generate. You can export/import loadout from RHS or other faction to OTAN units.