Track file attached.
In the track I am using VR. At first as explained by the OP, you can see the friendly HAFU prior to the datalink comming online for the F/A-18C.
Then I show that it is removed once the F/A-18C starts broadcasting.
Next you can see the Friendly HAFU work for the F5, but not the F18.
Finally I show that using the JHMCS, the friendly HAFU is never indicated, only once the contact is shown on the HUD. hafu bug-vr-hmd.trk