Not all tasks are updated during the battle.
This makes it difficult (or sometimes impossible) to know during the battle if you have already finished the task or not yet.
For instance:
“capture one point” and “mortar kills” are updated like many others.
but “10 kills with plane/tank” is not updated like some others.
Of course finishing the task only counts after completing the battle, but that goes for all tasks.
So all should be updated or none at all.
In this battle I have finished one task by capturing a point (visible) and killed 6 with my plane (not visible).