Copy-paste into Google Docs / Slides produces artifacts on top and right

[rhinopotamus]

Here's a screenshot that I think will make the issue clearer:

When I use the "Copy" button to copy-paste into any Google web product, I get these artifacts on the top of the image and the right of the image. In particular it looks like a few pixel columns are being shifted from the left edge of the image to the right edge of the image, and then the top couple of pixel rows are black.

Maybe there is something specific about how Google parses information from the clipboard, but I don't have this problem copy-pasting images from any other source.