Additional Breaches not spawning.

Going into a map with the breach modifier on the atlas node and while in the map, the modifiers say "Area contains an additional breach" but on a number of occasions now have found only 1 breach. Was a bit confused at first thinking the additional breach might refer to the main breach, but why would it say 'additional'?
It seems to me like maps that should have two breaches are fairly often not spawning the second breach.
For more info I have all 8 of my breach atlas points and have Frantic Invasion, Rising Pyre, Crumbling Walls, and Interdimensional Assault active in the Atlas tree.

"Area contains an additional breach" just means that it had the breach icon on the atlas map and will contain the one breach guaranteed.

I know there's no indication of the increases from the atlas passives (1, 3, 10 is it?). It doesn't say anywhere on the right side under the map, I've checked on multiple maps that DEFINITELY had 10 breaches.

What I don't know for sure is if you have tablets that gives "#% chance for your maps with breaches to have one additional breach" or something like that...if THOSE will say "Area contains 2 additional breaches" if they proc, I have no idea.

But the atlas passives definitely don't show anywhere if they've triggered.

Yeah I had thought that it might be referring to the maps inherent first breach. If so that's just a bit annoying then, calling it an 'additional' breach is just misleading.