masks not black outside of light source

My group had a little break for the summer. About 3-4 months I would create a map but throwing down all the walls and then just cover the entire place with one big mask. Then each character would have a light source. Before when I did this the map outside of the light source was just black. Now with version 3.7.3.4 the enitre map can be seen, but just with a haze over it. It still hides creatures in the darkness as it should.

My question is, is there any way to make areas of the map outside of a player's light completely black again? I do not want them to see the layout of the map outside their light source. I know I could create multiple masks and reveal as as they move into it, but unless I created large amounts of them, they would still see the layout of a dungeon room even if it was bigger than their light source.

 

Updating to 3.7.3.6 fixed the issue.