If you paste the captured screenshot from clipman, a degraded png image will be pasted

Maybe it's related to the clipboard plugin, but I haven't found anything in the code there that can save a fake png. If you save the image to disk, it will save a png file, always. Copying to the clipboard sometimes results in a fake png and I don't understand what causes this.

┌(monsterovich@pc)─(pts/1)─(~/.cache/xfce4/clipman)
└─(>) mediainfo image0.png 
General
Complete name                            : image0.png
Format                                   : PNG
Format/Info                              : Portable Network Graphic
File size                                : 677 KiB

Image
Format                                   : PNG
Format/Info                              : Portable Network Graphic
Format_Compression                       : LZ77
Width                                    : 878 pixels
Height                                   : 817 pixels
Bit depth                                : 24 bits
Compression mode                         : Lossless
Stream size                              : 677 KiB (100%)

mediainfo says it's a png but...

there are jpg artifacts in the image

if the file is saved to disk, it looks ok

xfce4-screenshooter --version
xfce4-screenshooter 1.9.8

If you use the flameshot app instead, copying to the clipboard always produces a normal image.