Larian Studios Forums Divinity: Original Sin 2 Divinity - Original Sin 2 - General [Bug] Permanent NPCs' red vision range

Sometimes (dunno the trigger) red vision range of every NPC on the map turns on of its own volition and doesn't go away even with save/load.
Later I've figured out to press Shift button for it to go away, but it's still an annoying bug.

It mays happen during an alt-tab but as you said, pressing shift is enough to toggle off the NPC vision.