Correct, 2D only.
Multiple occasions where I fragged a plethora of B-2 and F-117 to strike FRY air bases and other installations over night, only to return the next day (live server among friends) seeing no results.
I then scheduled strikes I could observe and noticed them flying over the target area, not disturbed by enemy air or SAM assets, and just fly home with no weapons expended.
I did an SP campaign test (also Balkans) yesterday. F-16 with LGB did drop one bomb each (no matter if 2-ship or 4-ship flight) but failed to hit the target.
Fragged one flight with dumb bombs and boom, target destroyed.
That is of course no reliable sample size at all, but something is off. I played this for years and never noticed any issues in 2D campaigns with flights not attacking their targets.
Let me know what I can do to help!