Halftone filter on a shape, uncovers the edge

[belief-begin-conjoin]

I have an issue with halftone pattern inside shapes that I can't resolve. 

If I create a basic shape like a circle or square etc. fill it with a black to white gradient, or a solid color and apply a halftone filter to it. It does create a halftone pattern of the gradient that you would expect. Also adds halftones at the edge of the shape. So it doesn't fade out to white. 

How can I get rid of the border/edge?

[firstdefence]

Add a black filled shape as a mask.

Halftone example edge removal.afphoto

[NotMyFault]

while this works  great in the specific situation, I’m wondering if there is a specific reason that you specify black? As far as i know the matter, the color is irrelevant when vector shapes are used for masking. Only the alpha channel information is used.

So i sometimes copy the basic shape and use it as mask, don’t care for colors at all. For the color at all. 
 

Please note that for pixel layers or mask layers, the color actually matters, and black would hide. So i tend to use white instead of black, to avoid bad surprises when you need to rasterize a vector shape, or use blend ranges.