OpenCV 3.4: Inpainting float mat produces visual artifacts

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Hey guys,

I am currently working with the fresh new opencv core function "inpaint" for floating point matrices. Therefore OpenCV 3.4. It works very well overall, nice work done there. However it sometimes produces visual artifacts (see attachment). Has anyone an explanation for that? I use navier stokes model, is this producing the errors somehow?

Best regards, Alex!