Only three Breaches per campaign zone?

Hi folks,

I've noticed that campaign zones in the Keeper's League only contain breaches the first three times you go through them. After that, no more breaches.

Is that by design?

Maybe I just play weirdly, but I like to take my time through the campaign, get decent-ish gear each stage before moving on, which means I often do campaign zones multiple times to farm some gear and currencies etc.

With the new Genesis Tree mechanic, I often tend to end up with more Wombgifts than I have Graftblood for, so I was re-running zones to farm extra blood. But, as mentioned, it seems that each one only gets three breaches, and then no more.

To test this, I ran two different zones twelve times each, and in both cases never saw another breach after the third run. I tried forcing new instances by CTRL-Clicking on the door, and letting the zone expire naturally before starting a new one, didn't make a difference.

Neither the Wiki nor Googling found any mention of a limit on the number of breaches per campaign zone, so I'm wondering if either a) it's there but no-one else runs zones multiple times so no-one else noticed it, or b) it's a bug.