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Accurate Boolean Operations help/query/bug


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I wonder if someone can shed some light on this.

I have attached file simply contains two  slightly overlapping donuts shapes which have been duplicated.

With the top (red) donuts selected I perform a Intersect operation. 




The result on screen  appears correct as expected, however if I select this top layer (the result of Intersect operation) and the next layer down (grey donut layer) and perform a  Boolean subtract it appears I don't get a accurate clean cut.


Any help would be appreciated :)


Affinity Photo Version 2, Affinity Designer Version 2 on PC and iPad

Windows 10 Pro, 64-bit operating system, x64-based processor

i7-7700K@4.20GHz, 32GB Ram, Nvidia GeForce GTX 1080Ti

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