I have just had the 4.2 update installed earlier today and it seems to have created an issue.
Previously, copying images from the body of an email (not as an attachment) from Outlook and pasting it into a new image would past the full image at its original resolution and size.
After the update, doing this now only gives me a portrait A4 shaped extract from the centre of the image to the size of the work area in Paint.net.
Without recopying the original image, I can paste it anywhere else and get the full image, which I can then copy and paste fully into Paint.net.
I've never had this happen before, and it seems this update has just created a small and unnecessary detour.
I have put together 3 screenshots just to visualise the above. (Google Drive link)