
There was a huge battle raging on at A22 for a long time. (See the call for help on screenshot). But there was no darbar of any kind, even though most of the combat was several k above ground level, up to 15k (bombers). This was the state for at least several minutes on my front end, I thought the battle up there had ended some time ago. Our HQ was up all the time (darbars were visible in other places), and I had played for at least 30 minutes in the arena.
Now shortly after this first screenshot the base dar went back up. And as soon as the enemy dots became visible, the darbar appeared as well:
When the base radar went down again about a minute late, the darbar did not disappear again.
This observation is in line with similar ones I made on other maps, when I suddenly encountered enemy planes at high altitude with no darbar in this or adjacent sector until literally a few moments before visually sighting the planes.