Censorize module creates dark borders

Processing
1

I continued playing with “round” images and how censorize module could be used to give a hint of the environment. I created an inverted circular mask, and blurred the surroundings. The censorize module creates darker artefactes on the image border. They cannot be impacted by the neighboring pixels, because the artefacts follow even if I change the crop.

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image889×754 115 KB

And here zoomed the border (100% view in darkroom) (first with censorize, the second without).
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image100×428 39.6 KB

Has anyone else noticed this?

2

It may be worth including a screen shot of the settings you are using in this module. Also DT version and OS might help. I am on Windows with DT V5.1 and can’t reproduce this problem.