Pandoran Colonies Forming In Mist-Repelled Areas

I just found a Pandoran Lair well within a zone that was mist-repelled. This area had been mist free for in-game weeks. I only discovered the location after defending a haven in the same mist-free zone. Before investing in upgrading the base, I thoroughly re-scanned the area with the proper tech to reveal Pandoran colonies. Nothing was revealed. Again this was in-game weeks prior to my finding this lair.

It is my understanding that colonies are only established in mist areas, not mist free areas…

It’s not mist free area, some lore/dialog quote it’s not stopping aliens only make them weaker.