Demogorgon Portals always have their auras visible to Survivors, regardless of whether Survivors are working on them.

The aura of Demogorgon's portals are constantly visible to Survivors. Whenever Demogorgon places down a portal and travels to another one, the auras of both portals become visible to all Survivors...

DEMOGORGON - When a portal is active, its aura is always revealed to the survivors

It's a game play bug with the demogorgon where anytime the demogorgon activates any of its portals around the map the aura's of all activated portals around the maps are shown for all survivors unt...