viewCaptureToView command in Parallel view shows weird horizontal shadow in the middle


I’m discovering a bug related to _ViewCaptureToFile and _ViewCaptureToClipboard command. When exporting view in parallel viewport (not perspective), exported images shows a weird shadow in the middle across the image horizontally. This happens in Rendered, arctic, and artistic view. What’s the solution?

see below for different view mode comparison:

Here is some info about the version of Rhino i’m using:

Hello- please update to 6.17 and see if that works any better - if not, please try a capture at viewport resolution and see if the problem shows.