Possible Bug with Select Page Region -> Delete

[mCHSNUg5Pz8cPap]

When I select a part of the attached page to delete, it causes the remaining image to become blurry.
Here is the file:

Sample.pdf

(179.38 KiB) Downloaded 8 times

I want to delete the part at the top that says "Replacement Sheet"
I select it using the "Select Page Region" tool and press delete. This removes the part that says "Replacement Sheet," but it makes everything else in the image blurry.
Am I doing something wrong or is this a bug?

Edit to add: the same thing happens if use the redact tool to remove "Replacement Sheet."

[Stefan - PDF-XChange]

Hello mCHSNUg5Pz8cPap,

This file contains of one single image with invisible OCR text layer on top.
So when you redact out the top part, the remaining part of the image has to be recreated and recompressed, so that would indeed result in a slightly off image quality, as the start was not great to begin with and it is obviously a lossy image format already, so consecutive changes to the image will only make the quality worse.

You can try to edit that image in an external image processing tool:

And maybe that will handle cropping part of it without heavy recompress of the rest better than the built in tool in the Editor.

Kind regards,
Stefan