While I was being able to capture this flag, the flag capture HUD thingy didn't show.
yeah, I noticed that too. But it only seems to happen in certain vehicles and certain flags. For me, at least.
Its a random bug that might have something to due with the pythoncode updating a flagstatus too slow.
Theres the flagbug too. This means that you cant cap the flag. In order to fix this bug, please get out of the capzone and re-enter it. If some random other guy is afk there and not responding try to get him kicked or killed.
I realized this lately. Happens also with the Stuart on Fall of Tobruk. Though the flag-capture-HUD isn't there, it is always you in the tank who will get the score for capping the flag, even if you arrived there at last. Basically it is like you're stealing the 2 points from someone else just by being there.