I have had things like this too lately and recently vs my memory of when I started the game 1.5yrsish ago.
The other nite I was heading into a base in the middle of the sector, as I planned out my attack, feeling secure from anything above as there had been no dar bar the entire flight over there, pop, there's a high pony, I'm at 10kish he's at 15Kish. This base in the middle of the sector, how'd he not create a dar bar for ~8mins to get where he was? He didn't just pop into the middle of the sector, and he didn't just hop up to 15K in a matter of the dozen or so seconds it should take the entire map to update.
I'm not sure if it could be something on my end, or in Latrobe's case, something on his end that would cause not seeing a dar bar that other ppl do???