I have reported back this issue multiple times since August 2019 using the feedback button but didn't get any response nor was it fixed:
Ever since my monitor upgrade from 1920x1080 to 3840x2160 I have issues copying and pasting images from the clipboard into other applications: The image is also scaled during paste.
I just do CTRL+A, CTRL+C and CTRL+V to paste the image (most of the time) in Office applications like Outlook. paint.net already recognizes that I'm on 150% but pasting somehow increases that value again.
To circumvent that I now finish my changes in paint.net, copy and paste it into Windows Paint and copy and paste it to the final application to get rid of the useless blow up.
If it's a feature instead of a bug, would it be possible to add a checkbox to the settings to alter the paste behavior (like "paste unscaled" or something like that)?