Running on Firefox Version 132.0.2 (64-bit) on Windows 10 Home (22H2) with Java enabled The area of effect for the fog of war tool that you have selected appears below the fog itself, which can cause problems when you have your GM fog of war opacity set high. Here's an example image, where I'm drawing a remove fog of war rectangle and my GM Fog Opacity is set to 97% (obviously at 100% you then can't see it at all). This affects both adding and removing fog on both the rectangle and polygon shapes. It's not the worst thing to work around, you can simply just set your opacity lower, but it can make trying to work on the fog while more or less seeing what the players see tedious with needing to repeatedly swap back and forth between opacities.
